Commodore 128 upgrades

Translates a PS/2 mouse into Commodore 1351-style analog mouse signals for the C64 and C128.

For this system (exact model): The current seller explicitly supports the C128. Because 1351 position data uses the SID paddle inputs, confirm that the installed SID or replacement implements the analog-input path.

Retro Computer Store listed an assembled adapter as available for USD 16 on 2026-07-30. PCBWay exposes a through-hole fabrication route with Gerbers, a bill of materials, and programming notes. The current assembled version supports PS/2 mice and PS/2-compatible serial mice but explicitly does not support a USB mouse through a passive PS/2 adapter. A working SID analog-input path is required; some replacement SID implementations omit it.

Runs a cartridge-resident suite of health, speed, alignment, sector, and command tools for 1541-family floppy drives.

For this system (exact model): The maker reports that the cartridge runs on a C128. A device-9 image avoids the internal device-8 conflict on a C128DCR. Standard 1541-compatible functions can work with a 1570 or 1571, but this is not a comprehensive test of those drives' extra features.

Protovision listed 22 units at EUR 25 with a one- to two-week shipping estimate on 2026-07-30. Jani also publishes free cartridge images for device 8 and device 9. The software alignment display is a health indicator, not a substitute for a factory analog alignment disk and oscilloscope.

Replaces a Commodore 2364 ROM with a readily available 27C64, 27C128, 27C256, or 27C512 device.

For this system (exact model): The seller also specifies C128 ROM replacement. Confirm the exact socket, required image, pin clearance, and capacity before installation; larger devices require the documented upper ROM offset.

The product selector offered all three build levels on 2026-07-25. The included W27C512 option is blank; the buyer must provide and program an appropriate ROM image.

Adds wired 10 Mbit Ethernet and RR-Net-compatible networking to C64-family computers, with an optional multi-ROM socket.

For this system (exact model): The maker explicitly supports C128, C128D, and C128DCR systems. The optional ROM hardware can pair alternating C64 and C128 images, but the builder must provide and configure a suitable programmed EPROM or flash device.

The current RETRO Innovations store exposed the 64NIC+ category and a Choose Options purchase path on 2026-07-30. The product comes in four case and ROM-selector configurations. Network software, an Ethernet cable, and a 10 Mbit-capable network connection are required separately.

Current composite and S-Video cable options for compatible Commodore computers, with a five-pin composite branch that also serves selected Atari systems.

For this system (exact model): Both current cable branches explicitly list the C128. The eight-pin cable handles composite and S-Video from the 40-column analog A/V port, not 80-column RGBI. Optional stereo requires a compatible second audio source rather than the stock mono output alone.

The two five-pin products exposed Add to cart controls, while the eight-pin product exposed current priced options on 2026-07-30. The five-pin cable and adapter carry composite video and two audio connectors; those connectors do not create an independent stereo source in a stock mono computer. The eight-pin S-Video branch requires a host that supplies separate luma and chroma. Its stereo option requires a compatible second audio source on the designated extra pin. Match the connector, resistor, audio wiring, display input, and regional video standard before ordering.

A current 1.5-meter five-pin DIN to SCART cable for several Commodore computer families.

For this system (exact model): The seller explicitly lists the C128. The cable handles the computer's 40-column composite output, not its separate 80-column RGBI output.

The product page exposed a current Add to Cart path on 2026-07-30. The cable is 1.5 meters long and terminates in a five-pin DIN plug, so it does not carry the separate luma and chroma signals used for S-Video. Confirm that the intended display accepts composite video through SCART and that its regional video standard matches the computer.

Replaces one SID socket with two or three emulated SIDs, or combines SID emulation with SFX Sound Expander-compatible FM synthesis.

For this system (exact model): The developer explicitly supports all C128 board revisions. Current firmware includes C128 2 MHz and communication-mode fixes. Confirm the selected second- and third-SID addresses and follow the C128 signal-connection instructions.

The official store showed four ARM2SID variants in stock on 2026-07-28, priced from EUR 53 to EUR 58. Choose the cable, optional second socket, and host-specific version carefully. Additional SID and FM modes require the documented chip-select and audio connections; the optional second socket does not carry EXT IN.

Microcontroller-based plug-in replacement for a C64 or C128 6581 or 8580 SID with software configuration, updateable firmware, and analog control inputs.

For this system (exact model): The official store and developer documentation explicitly support the C128. Configuration and firmware updates run on the C128 as well as the C64; install the module in the correct SID orientation and follow the current software instructions.

The official Retrocomp product page showed more than 10 ARMSID v1f units in stock at EUR 34 on 2026-07-28.

Breaks compatible Atari and Commodore monitor-port signals out to S-video, composite video, and bridged mono audio connectors.

For this system (exact model): The seller explicitly lists the Commodore 128 as composite-only with this breakout. It does not advertise an S-video path for the C128.

The current product data and catalog reported the assembled breakout in stock on 2026-07-27. Cables and any required computer modification are not documented as included.

Uses one microSD cartridge and interchangeable adapters to load software and provide selected storage, cartridge, memory, and diagnostic functions on many vintage computers.

For this system (exact model): The current product page explicitly supports C128 and C128D operation through the C64/128 adapter. Its options allow C128 or C64 startup behavior, while BBT files can select the appropriate operating system.

The current store listed the assembled BackBit Pro for $129 on 2026-07-27 with one assembled adapter choice included. A microSD card is not included. Additional adapters are sold separately and require through-hole soldering. Firmware updates use the microSD card. An original C64 Assy 326298 needs the documented reset fix, and the SX-64 needs the straight C64/128 adapter.

Converts Commodore 128 80-column RGBI into 15 kHz analog RGB for a compatible display or a separate VGA scaler.

For this system (exact model): The maker explicitly names the Commodore 128, 128D, and 128DCR and designed the DAC for their 80-column RGBI output. The separate 40-column VIC output needs another conversion path.

The official site says sales resumed through its Square store in January 2024, but current stock was not independently confirmed on 2026-07-30. BIT-C-128 is not a scan converter: direct use requires a display that accepts roughly 15.75 kHz analog RGB. An ordinary VGA display also needs a GBS-8200, GBS-8220, or another suitable scaler. Supply regulated 5 V power and the cables or adapters required by the selected display path.

Uses a PS/2 keyboard on supported Commodore computers or converts their original keyboards and optional joysticks for a PS/2-equipped host.

For this system (exact model): The maker supports the flat C128 plus C128D and C128DCR. A flat C128 PS/2-keyboard installation requires wiring X5 internally. A C128D or C128DCR needs a short cable or gender-changing arrangement rather than a rigid gender bender, plus the documented jumper settings.

The RETRO Innovations store exposed a configuration selector and Add to Cart path on 2026-07-30, with the bare PCB listed at USD 6 and configured kits priced separately. Kits and assembled units are made after ordering and normally take four to five weeks. The maker explicitly treats C=Key as a project rather than a fully supported product because its firmware is not extensively tested or easily upgraded; an AVR programmer is strongly recommended. Use a true PS/2 keyboard because passive USB adapters may not work.

Combines the Commodore 128's separate 40-column analog and 80-column RGBI outputs into a switch-selectable SCART connection.

For this system (exact model): The adapter is designed specifically for the C128's separate 40-column VIC-IIe and 80-column VDC outputs. Retro-Updates offers case choices for the flat C128 and both C128D case styles; confirm current case availability and cable clearance for the exact machine.

Retro-Updates marked revision 5.1 sold out and soon available again on 2026-07-30. The official project page still describes direct email ordering at an older EUR 22 price, but its order news is from 2021; confirm current production, price, revision, case choice, and shipping before paying. This adapter does not scan-convert the original video timing. A SCART display must accept the signals directly, or a separate SCART-to-HDMI converter is required and may produce variable results.

Converts the C128's 80-column digital RGBI output to analog RGB and composite sync for a separate video scaler.

For this system (exact model): The seller explicitly documents the C128 80-column RGBI port. The separate 40-column video output is not handled, and the page does not separately name or test the C128D or C128DCR.

Protovision reported eight units in stock at EUR 30 on 2026-07-30. This adapter converts signal levels and combines sync but does not raise the scan rate. Its documented setup uses a separate GBS-8200 or GBS-8220, which is not included. Follow the page's normal/inverted-sync procedure if GBS auto scan does not lock cleanly.

A passive buildable adapter that converts C128 80-column RGBI to 15 kHz analog RGB and adds monochrome composite output.

For this system (exact model): The project is specifically for the C128's 80-column RGBI output. Confirm that the exact display accepts 15 kHz analog RGB, separate 5 V H/V sync, and no VGA identification signals; an ordinary VGA connector alone does not establish compatibility.

The repository publishes KiCad schematic and board files plus Gerbers. This is not a scan doubler or scaler, so the connected display must accept 15 kHz analog RGB with separate 5 V horizontal and vertical sync. The design has no CGA brown fix, does not provide VGA identification or communication signals, and will not work with a downstream converter that requires composite sync. The maker reports a successful Dell 27-inch monitor test but calls the test computer a 'C128cr'; do not infer separate C128D or C128DCR testing from that ambiguous label.

Socketed daughterboard that expands the C128 or plastic C128D from 16 KB to 64 KB of VDC video memory.

For this system (exact model): The maker explicitly lists the flat C128 and plastic-case C128D, both with 16 KB VDC RAM. The metal C128DCR is cited only as the model that already provides 64 KB, not as a target for this upgrade.

The maker's store exposed an active order path and reported stock on 2026-07-30. Installation requires removing the original metal heatsink and carefully extracting and reinstalling the MOS 8563 with the correct orientation. The maker recommends a modern low-profile heatsink because the daughterboard raises the chip. Reaching the VDC in some C128D systems may require removing the power supply, floppy drive, and drive controller.

Combines a Commodore 128's 40-column and 80-column video paths in one switchable external adapter.

For this system (exact model): The seller documents the flat C128 and C128D with the included mounting tabs and the C128DCR with a separate tab. Connect both the eight-pin analog A/V port and nine-pin RGBI port. The normal 5 V path comes from the C128 A/V port; use the selectable external input only as documented.

Pyrofer's Projects lists the NTSC board and its separate C128DCR mounting tab as out of stock. The normal package uses tabs for the flat C128 and standard C128D; the differently spaced C128DCR requires the separate tab. Although the board has a PAL/NTSC selection, the seller says changing format also requires a different oscillator IC, and the listed package includes the NTSC oscillator.

Boots before the normal KERNAL to diagnose RAM and ROM faults on a Commodore 64 that cannot reach its startup screen.

For this system (exact model): Use the cartridge in C64 mode. The service-ROM documentation describes it as useful for low-memory faults on a C128, but it does not test upper C128 memory or replace C128-specific diagnostics.

Retro Rewind listed its cartridge in stock at CAD 22 on 2026-07-30. TFW8b documented a compatible alternative for C64, C64C, SX-64, and C128 in 64 mode, but that listing was out of stock. Wait up to 60 seconds for a result. The original 781220 RAM routine covers only the lowest 4 KB, and the cartridge does not test the chips and I/O covered by a harness kit.

Adds a Yamaha V9958 or V9938 video processor, 128 KB of dedicated VRAM, RGB output, sprites, and enhanced graphics modes through the expansion port.

For this system (exact model): The project includes C128-capable GAL and demonstration options. The maker observed false pixels on a C128DCR, especially in 2 MHz mode, and suggests that the longer traces or machine design may be responsible. Treat that host and speed combination as unreliable.

The project publishes the final 1.0 PCB, schematic, Gerbers, GAL files, documentation, and demonstration software, but no current assembled seller was verified. A build requires a V9958 or modified V9938 configuration, two compatible DRAM devices for 128 KB of interleaved VRAM, programmable logic, an EPROM or EEPROM if desired, and substantial surface-mount assembly.

Buildable NodeMCU Wi-Fi modem for the Commodore 64 user port with voltage level shifting and status indicators.

For this system (exact model): The assembled revision-2 seller page explicitly names the Commodore 128. Current availability is limited to building the released project unless another assembled seller is found.

The complete project remains downloadable. Retro-Updates listed an assembled revision-2 version for the C64 and C128, but it was out of stock on 2026-07-30. Revision 1 fits only the smaller WeMos NodeMCU v3 form factor; revision 2 supports both common board widths.

Passive adapter-cable options for powering a Commodore 128 from a suitable modern C64 power supply.

For this system (exact model): Use the C64-to-C128 direction: a round seven-pin female connector accepts the C64 supply lead and a rectangular five-pin male connector enters the computer. Electroware explicitly names the C128 and C128D; the other pages do not distinguish flat C128, C128D, and C128DCR chassis. Confirm that the exact computer uses the external five-pin input and that the selected modern supply has enough 5 V current. Never use connector fit alone as proof of electrical suitability.

On 2026-07-30, CMD Marketplace listed its 15 cm adapter at USD 19 with five units remaining, Electroware listed its 16 cm adapter at EUR 15.99 with dispatch in three to five days, and Keelog listed its 22 cm adapter at USD 23.99 or EUR 20.99. Commodore4ever listed its 90-degree option at USD 14.99, but the page did not expose unambiguous variant stock. CMD Marketplace requires a new switching C64 supply capable of at least 3 A and explicitly warns against using an old original C64 supply. Treat that as a minimum for its adapter and confirm the requirements of any other adapter and supply combination before use.

Adds the loopback modules needed for complete 586220 C64 or 785260 C128 port and interface diagnostics.

For this system (exact model): Full C128-mode coverage requires a 785260 or 588121 diagnostic image and the C128-specific keyboard dongle; the included C64 keyboard dongle does not test the C128 keyboard. Use the longer C128 cable dimensions documented by the open project. A C64 diagnostic in C64 mode does not exercise all C128-only RAM and logic. Retro Rewind's support page names the C128DCR, but the open designer says the original dongle cannot work at its keyboard jack because the jack lacks +5 V. Human review found no documented alternate power path, so do not claim C128DCR keyboard-loopback support for the current retail dongle.

Current routes on 2026-07-30 included Retro-Updates' EUR 17.95 harness with an Add to Cart path, Retro Rewind's CAD 75 harness with a one- to two-week lead time, Retro Rewind's separate CAD 22 C128 keyboard dongle in stock, and AMI64's GBP 49 complete eight-ROM kit. Retro Electronics had one complete kit on 2026-07-25 but documented only one tested PAL C64 board revision. Confirm the exact harness revision, cartridge, keyboard dongle, cable lengths, model settings, and included manuals before ordering. Human review found no evidence that the current retail dongle solves the documented C128DCR keyboard-jack power conflict.

Packages 586220, 785260, and related service ROMs as current single-ROM and switchable multi-ROM diagnostic cartridges.

For this system (exact model): Retro Rewind's current 785260 cartridge tests C128-mode RAM, ROM, dedicated ICs, and interfaces when paired with the full harness and C128 keyboard dongle. Sven Petersen's open PCB also supports 785260 and 588121 images. By contrast, Retro Rewind's four-ROM C64 cartridge supports the C128 only in C64 mode and leaves C128-only memory and logic untested.

Current choices on 2026-07-30 included Retro Rewind's in-stock CAD 22 C64 586220++ and C128 785260 cartridges, its CAD 40 four-ROM C64 cartridge with a two- to three-day lead time, AMI64's GBP 19 eight-ROM C64 cartridge with an approximately seven-day lead time, ogHugo's USD 26.99 before-tax two-sided C64 cartridge with an Add to Cart path, Retro-Updates' EUR 17.99 two-sided C64 cartridge, and C64iSTANBUL's orderable two-ROM PCB with current fabrication files. DIY8BIT's USD 22.95 781220/586220 cartridge was unavailable while its Etsy shop was on break. Retro Rewind's older Dual Diag route now displays the store's not-found page. ROM sets and model support differ by variant; a full port test requires a separately bought or built harness.

Swaps a Commodore computer's two control ports while preserving both digital joystick and analog mouse or paddle signals.

For this system (stated family): A 2016 production run reports successful use on the metal C128D and planned a separate C128-compatible case. The flat C128, plastic C128D, and C128DCR are not established by the retained evidence, so verify fit and operation for the exact chassis.

The surviving AmiBay production runs are closed sales archives. COREi64's former product route is currently replaced by a store-wide notice saying the shop will return in Fall 2026, so no current C8D order path is verified. The original C8D maker site also failed Tavily extraction twice after the required retry and is recorded as WF-050.

Adds SD-card PRG and TAP loading, a fast loader, Wi-Fi file transfer, and cross-development tools through the cassette port of several Commodore 8-bit families.

For this system (exact model): The maker reports successful C128 testing. Disable JiffyDOS because it disables cassette use and occupies the cassette buffer. Do not combine Cassiopei with another cassette-port device except a datasette as documented.

The maker states that Cassiopei v2.0 is not available. The hardware is described as functionally complete, while firmware, software, manuals, and downloadable updates remain published.

Adds two joystick ports to a compatible Commodore user port for four-player games that support the CGA adapter protocol.

For this system (exact model): Protovision and current assembled sellers explicitly support the C128. The sources do not distinguish the flat, plastic D, and DCR case forms. Use software that supports the CGA user-port joystick protocol and connect the adapter only while power is off.

Protovision showed 17 individual Computers adapters in stock at EUR 25 with a one- to two-week shipping estimate on 2026-07-30. CBMretro also exposed an add-to-cart route for Pasi Lassila's enhanced Neat design at EUR 26.90, and ZGCS showed two assembled compatible boards at USD 22 on Tindie. Install or remove the adapter only with power off and observe connector orientation. Do not connect it to a Plus/4: individual Computers warns that doing so risks damage. The PET 2001 user ports lack the required power connection, and the maker discourages modifying a historic machine to add it.

Converts digital RGBI into 15 kHz analog RGB and can break out a Commodore 128's 40-column S-Video and audio.

For this system (exact model): The product is designed for the C128's 80-column RGBI output and provides an optional header for its 40-column luma, chroma, audio, and 5 V signals. It does not change scan rate. Check power polarity and the HD-15 pin-9 path before connection.

The maker lists the assembled board as out of stock and publishes no fabrication package. This is not a scan converter; the display must accept the source timing, normally about 15 kHz, or use a separate scaler. The maker's design history says the completed logic omits the valid intensity-only dark-gray color, which appears black. The board also passes 5 V to HD-15 pin 9; verify that the attached cable and display do not ground that pin.

Converts MDA, CGA, EGA, and Commodore 128 RGBI into 15 kHz analog RGB with selectable sync.

For this system (exact model): Connects to the C128 80-column RGBI port in CGA mode. The maker recommends routing the C128's monochrome video signal to composite sync for displays that reject the simply combined sync output. The separate 40-column output is not converted.

The maker labels the current project revision released, but its assembled Tindie listing said the seller was taking a break on 2026-07-30. The maker publishes a schematic but not a complete fabrication package. This is not a scan converter: an ordinary VGA display needs a GBS-8200, GBS-8220, OSSC, or another compatible scaler. The board requires 5 V through Micro-USB or a suitable GBS power connection.

Licensed, made-to-order recreation of the CMD hard drive with BlueSCSI v2 and externally accessible SD storage.

For this system (exact model): The seller explicitly lists the C128, C128D, and C128DCR. Supply an IEC serial cable and compatible power supply and review the original CMD HD manual before partitioning.

ToTs RETRO exposed an Add to Cart path at USD 899.99 on 2026-07-27. Each drive is made to order with an advertised lead time of up to one week. Supply an IEC serial cable and a compatible 1581 or 1541-II power supply; neither is included. The seller has not tested simultaneous tape-drive use.

Current switched cable variants for using the C128's 40-column analog video and 80-column RGBI output with one display setup.

For this system (exact model): The seller explicitly documents switched C128 40-column and 80-column operation. The standard cable provides composite for 40 columns and 16-color RGB for 80 columns; the premium branch adds S-Video and two RCA audio connectors. C128D and C128DCR fit are not separately documented.

Both Tindie pages exposed current prices and ordering controls on 2026-07-30; the premium version explicitly reported three units left. Shipping depends on the selected destination, and no rate was shown during extraction. The seller documents a shielded cable, an onboard micro PCB, and an operating LED. No scan conversion is documented, so confirm that the intended display accepts the cable's original-timing composite, S-Video, and SCART RGB signals.

A simple buildable RGBI-to-analog-RGB adapter for 15 kHz-capable displays with a VGA connector.

For this system (exact model): The project is designed and tested for the flat Commodore 128's 80-column RGBI output. It needs a monitor that accepts 15 kHz analog RGB through its HD-15 connector; connector shape alone does not establish compatibility.

The PCBWay project supplies a shared board-order path and a short component list. Assembly is required. This is explicitly not a scan doubler, so most ordinary VGA displays will not work; verify that the exact monitor accepts 15 kHz analog RGB. The maker reports a successful test with a flat Commodore 128 and an Acer G206HQL, but does not separately document C128D or C128DCR testing.

External displays for checking the 5 VDC and 9 VAC outputs of Commodore power supplies, with the MkII adding current measurement under load.

For this system (exact model): The review reports seller-stated C128 support but does not test it or identify the required cable, connector, supported chassis, or reset wiring. Do not attach a C64 seven-pin cable to a C128 without the exact configuration.

The exact review was published in March 2020 and a February 2023 comment says the seller was still making the monitors. The review describes an unofficial Commodore-styled product made by an unnamed Australian builder, not a verified Commodore-manufactured accessory. A current-looking Pocket 1501 eBay route failed exact Tavily extraction and failed again after the required 60-second retry under WF-068, so its maker, stock, price, package, and relationship to MkI and MkII remain unverified. The separate FDD II drive-supply monitor is not folded into this host-monitor family. This device displays readings; no automatic cutoff, regulation, over-voltage clamp, fuse, or other protective action was verified.

6522 VIA interposer that changes a Commodore 1541 drive between device IDs 8 through 11 without cutting its original jumpers.

For this system (bus/interface): Use through a separate compatible 1541 drive. The page does not establish use inside a 1571 or a C128D-family internal drive.

TheRetroChannel listed five boards in stock on Lectronz on 2026-07-27. External wiring and DIP switches are not included. A drive with a soldered 6522 first needs the chip desoldered and a socket installed; an external switch may require case cutting.

Upgrades an original Commodore 1764 REU from 256 KB to 512 KB and supplies parts that can also repair or expand other 17xx REUs.

For this system (exact model): The seller explicitly names the C128 and C128D. It includes two 430-ohm resistors and mentions an R4 change for C128 use, but does not publish a complete procedure; verify the exact REU revision before modifying it.

The current Shopify product page exposed a priced checkout product on 2026-07-29. This is a component kit for an original REU, not a complete memory cartridge. The page does not provide a complete board-revision-specific installation procedure; use appropriate Commodore service information, ESD precautions, and an experienced installer.

A period automatic RF switch box currently offered as new old stock for Commodore 64 and 128 systems.

For this system (exact model): Poly.play files the original switch box under Commodore 64/128 hardware. It handles RF television output rather than the C128's separate 40-column baseband and 80-column RGBI ports.

Poly.play listed original part number 252652-01 as immediately available in original packaging on 2026-07-30. This is finite new old stock, not a modern video converter. It requires a television or demodulator with a compatible analog RF input, connector, channel, and regional broadcast standard; the seller page does not publish those electrical details.

Current C64 and C128 user- and cartridge-port boards that expose labeled pins for prototyping and hardware development.

For this system (exact model): Both current product titles explicitly name the C128. The seller does not separate flat C128, C128D, and C128DCR fit or document model-specific clearance. The expansion-board description conflicts with its title and does not supply full electrical details; verify the exact board and connector before use.

Commodore4ever exposes current priced product variants for separate C64/128 user-port and cartridge or expansion-port boards. The user-port page documents its labeled male header and intended test uses. The expansion-board title and board label say EPB and cartridge or expansion port, but its body mistakenly describes access to the User Port and does not enumerate its signals. Human inspection found these guide breakouts to be basic passive pin extenders with no visible active components. No buffering, isolation, fusing, or current limiting is documented; exposed computer pins should not be treated as protected. Syzygy's C64 user-port version is retired and needs its selected header rows soldered.

Breaks a compatible Commodore A/V port out to S-Video, composite video, stereo SID audio, and a stereo mini-jack.

For this system (exact model): The maker explicitly lists the C128 and C128D. The C64 OS hands-on feature warns that the breakout physically blocks the adjacent IEC serial port, so plan another serial-cable route or disconnect the adapter when that port is needed. The C128DCR is not separately named.

The maker showed four V2 units in stock with a working cart path on 2026-07-29. Early C64 Assy 326298 machines use a five-pin video socket: composite output works, but S-Video does not. The optional SID-ground noise-reduction jumper must not be enabled on an Ultimate 64 board.

Adds experimental USB host and device hardware through Commodore user and cassette ports.

For this system (exact model): The project describes C128 support as an extension of the C64 design, but publishes no C128 test evidence. Confirm electrical compatibility, port access, power, and software before attempting a build.

Revision 1.0A is marked okay but was tested only on a PET. Revision 1.1A adds separately regulated, switchable USB host power but is explicitly untested. The interface uses both the user port and cassette port; PET ROM interrupt handling can switch cassette-motor-controlled USB power off unless software works around it. usb65 describes preliminary keyboard mapping, limited features, broken MAX3421 hub enumeration, and only partly working device mode. USB mass storage and networking are future plans, not supported features.

Host-specific passive A/V adapters for the VIC-20, C128 family, Plus/4, and Ultimate64 replacement mainboards.

For this system (exact model): The seller explicitly lists the C128, C128D, and C128DCR. This variant provides composite, S-Video, audio input, and mono or optional two-channel output from the 40-column A/V port. Optional right-channel audio requires a modified computer with a second source on pin 7; the adapter does not convert the 80-column RGBI output.

Commodore4ever exposed active Add to cart controls for all four variants on 2026-07-30. The Ultimate64 board uses a different A/V pinout from an original C64; do not use that adapter on a stock C64 or assume compatibility with the newer Commodore 64 Ultimate. The C128 variant handles the 40-column analog output, not the separate 80-column RGBI port.

Protected switched-mode replacement supplies for the C64 and round-connector VIC-20CR, with separate adapters for the C128 and Plus/4.

For this system (exact model): Each current ATOM page says the supply can power a C128 through a separately sold adapter. Commodore4ever's live 90-degree adapter page provides a 64-to-128 option and recommends a modern supply such as ATOM, but does not identify every ATOM revision, connector pinout, current limit, stock state, or supported C128 chassis. Do not connect the seven-pin C64 lead directly or improvise a pinout.

On 2026-07-30, Commodore4ever listed the original ATOM and ATOM v2.5 at USD 59.99 and ATOM RETRO at USD 69.99; all three were sold out. The official Plus/4 adapter was also sold out at USD 24.99. A separate live 90-degree adapter page listed a 64-to-128 option at USD 14.99, but did not expose unambiguous variant stock or identify every supported ATOM revision. The original ATOM page lists separate North American 120 VAC and European 230 VAC configurations, ATOM v2.5 lists only the North American input, and ATOM RETRO says its European version is currently unavailable. Surviving pages provide too little detail to establish exact specifications or final availability for the older PS-64 with LED and PS-64/128. Do not assume that ATOM specifications apply to those predecessor models.

User-port Wi-Fi modem for reaching Telnet BBS services from several Commodore 8-bit computers.

For this system (exact model): The seller documents a 2400-baud user-port mode. A 9600-baud mode may work in C64 mode when a 1571 or 1581 is not in use, but the seller warns that UP9600 can lock up or prove unreliable without the required settings.

The seller's collection listed the modem as sold out on 2026-07-30. An optional case is an accessory for the same modem family. The product page does not provide a public firmware or complete hardware build package.

Provides a new-production Competition Pro-style microswitch joystick with a nine-pin connector for classic computers.

For this system (exact model): The current seller explicitly lists the C128. Use a standard control port and distinguish this nine-pin Retro model from Speedlink's USB-only Competition Pro versions.

AMIGAstore listed the Competition Pro Retro at EUR 32.75 but marked it out of stock with restock T.B.A. on 2026-07-30. The store still offers a stock-notification route. Do not substitute the currently available Competition Pro Extra without an adapter: that model uses USB-A for modern hosts rather than a classic nine-pin joystick plug.

Turns a C64 or C128 into a stand-alone SID synthesizer with keyboard performance, real-time controls, MIDI support, and optional six-voice stereo.

For this system (exact model): The maker and current seller explicitly name the C128. Confirm the required startup mode and cartridge behavior on the exact C128 revision. MIDI, paddle, and second-SID accessories remain separate.

Protovision showed 12 orange Cynthcart 2.0.1 cartridges in stock at EUR 38 with a one- to two-week shipping estimate on 2026-07-28. The maker also publishes ROMs and source for personal use, but does not permit third-party cartridge sales. The project page labels 2.01 current while also listing a 2.0.2 source reorganization, so check the included ROM revision if that distinction matters.

Three-slot C64 and C128 cartridge-port expander with per-slot switching, a fuse, status LEDs, and reset.

For this system (exact model): The current reproduction explicitly lists the Commodore 128. Historical EX64 documentation limits C128 use to C64 mode.

AMI64 presented a current-priced listing on 2026-07-27. The seller explicitly excludes the Commodore 64 Ultimate and Ultimate 64. Cartridge combinations can still conflict electrically or in the memory map, so change connections only with power off and enable only known-compatible combinations.

Connects a Commodore expansion port to external MIDI equipment through MIDI In, Out, and Thru sockets.

For this system (exact model): The seller explicitly names the C128. Confirm the intended C64-mode software, cartridge-port behavior, and address compatibility on the exact C128 or C128D.

Human review confirmed on 2026-07-28 that the linked seller item is currently orderable. The seller says the cartridge includes instructions; Cynthcart, an expander, software, and MIDI cables are separate.

Adds four 8-bit digital audio channels with stereo output through the Commodore user port.

For this system (exact model): The detailed C64 OS feature explicitly names the C128 and C128D. Confirm software support and CIA behavior in the intended mode before purchase; the current seller page describes only C64 use.

The Shareware Plus page was last updated on 2025-08-01 and then claimed email ordering, but it exposes no conventional store or current checkout path. HR-061 confirmed that the original maker URL is gone and closed with direction to stop pursuing the unread Mk2 path for now. Availability remains unknown; PCBWay says the author stopped sharing the Mk2 there.

Historical breadboard adapters for prototyping through a Commodore control port or the VIC-20 expansion port.

For this system (exact model): The joystick-port variant explicitly supports the C128 through its nine-pin control port. The retained documentation does not distinguish flat and desktop C128 models or describe protection, so verify connector clearance and treat every exposed line as unprotected.

C64 OS preserves the former $13 joystick and $19 VIC-20 listings, but no current product was exposed on Dorktronic's eBay profile in July 2026. The joystick item URL also failed two Tavily extractions after the required 60-second retry and is logged as WF-062. Treat both boards as used-market finds. Documentation was not included. Both designs expose computer power and signal lines directly; the VIC-20 feature explicitly warns that improper prototyping can damage the computer.

Current protected replacement supplies with separate direct-connect C64/VIC-20 and C128 versions.

For this system (exact model): Choose the direct C128 version with its rectangular five-pin output. Its page explicitly names the C128 and C128C but does not establish internal-supply replacement for a C128D or C128DCR. The C64 version can instead be used only with Electroware's separate adapter.

On 2026-07-30, Electroware listed the eleventh-revision C64 version at EUR 46.99 and the twelfth-revision C128 version at EUR 52.99, both with dispatch in three to five days. Each has regional mains choices and an optional Adjust and Protect trim of roughly 4.9 to 5.3 V. Buy the direct version for the computer; the C64 model reaches a C128 only through a separate adapter.

A single replacement supply that powers a C64 or later VIC-20 together with a 1541-II or 1581 floppy drive.

For this system (exact model): The seller permits C128 use only through its separate C64-to-C128 adapter. The page does not distinguish flat C128, C128D, and C128DCR chassis. Confirm the adapter, connector, and load before ordering.

Electroware listed the twelfth-revision supply at EUR 68.99 with dispatch in three to five days on 2026-07-30. Regional mains configurations and an optional Adjust and Protect 5 V trim are offered. C128 use requires a separate C64-to-C128 adapter; choose and verify that adapter rather than connecting the C64 lead directly.

A calibrated cassette-port display that measures the computer's live 5 V rail while preserving the Datasette connection.

For this system (exact model): The seller explicitly supports the C128 through its cassette port but does not distinguish flat C128, plastic C128D, and metal C128DCR chassis. Verify physical access before ordering and attach or remove the meter only with power off.

Electroware listed the factory-calibrated meter at EUR 18.99 with dispatch in three to five days on 2026-07-30. It measures the live 5 VDC rail only. It does not display 9 VAC, apply a test load, regulate voltage, or automatically disconnect a failing supply.

Modern VIC-1011-style user-port RS-232 adapter with status lights, reset, and a software-dependent 9600-baud mode.

For this system (stated family): The seller names the C128 and C128D. UP9600 mode conflicts with C128 Burst Mode devices such as 1571 and 1581 drives; use ordinary mode when those peripherals are needed.

Tindie marked the adapter out of stock on 2026-07-30 and says it has been sold out since 2026-01-05. A DB25-to-DB9 adapter is an optional passive accessory, not a separate catalog product.

Cartridge fast loader for a Commodore 64 or 128 using an existing SD2IEC device or Commodore 1541-family disk drive.

For this system (exact model): The current seller explicitly lists the C128. Use the cartridge in its supported C64-style workflow with a separate compatible SD2IEC or 1541-family drive.

TFW8b exposed an active product page with selectable options on 2026-07-27. This is an accelerator for an existing storage device, not storage by itself. Loading speed and compatibility depend on the program and attached drive.

Period user-port adapter for connecting low-speed RS-232 equipment to Commodore 8-bit computers.

For this system (exact model): Use standard RS-232 mode. The builder explicitly warns that the C128 already supports 9600 bps through its user port and that configuring EZ-232 for UP9600 will lock the computer.

The surviving builder document describes the original kit and its setup, but no current sale or complete public fabrication package was verified. Look for an original assembled adapter or kit on the used market.

Current and DIY versions of the C64 and C128 utility cartridge with fast loading, freezer, monitor, BASIC extensions, and desktop software.

For this system (exact model): The original manual explicitly supports the C128 and normally starts it in C64 mode. The cartridge reset returns to C64 mode, while the computer's reset button returns to C128 mode. C64iSTANBUL also names C128 expansion-port operation, and 101% firmware adds a monitor return path for C128 use. These are C64-mode utility functions rather than a native C128 desktop or freezer.

Daniel Mantione currently offers the assembled Final Cartridge III 101% with a case through his project page and SellMyRetro. It arrives without firmware, so the buyer must flash a compatible image before use; version 2 of the 101% firmware and the C64 flasher are available from the maker. The separate C64iSTANBUL III+ project offers an orderable through-hole PCB, bill of materials, and 64 KB or 256 KB EPROM images, but it requires assembly and an EPROM programmer. PCBWay labels that shared hardware project CC BY-SA 3.0. The original and derivative firmware remains copyrighted and is not presented as freely licensed.

Adds a software-controlled FM receiver to a Commodore 64 or 128 through the user port, with an optional real-time clock and station storage.

For this system (exact model): The current seller explicitly includes native Commodore 128 FM RADIO software. Confirm the intended C128 mode, user-port clearance, audio connection, and disk-drive workflow before ordering. The C128D and C128DCR are not separately named.

Protovision showed eight units in stock with a one- to two-week shipping estimate on 2026-07-29. The optional DS3231 module and its CR2032 or LIR2032 battery are not included. The seller says the supplied software is incompatible with SD2IEC and similar devices and strongly recommends an original disk drive.

FPGA-based pin-compatible 6581 and 8580 replacement with two complete SIDs, six-voice stereo, analog inputs, paddles, and mouse support.

For this system (exact model): The maker explicitly supports the C128 and provides a model-specific installation video. Follow the C128 procedure and choose an address that does not conflict with other hardware.

Human review confirmed on 2026-07-28 that the advertised KryoFlux store item is gone. The project documentation, firmware, and configuration software remain available, and used units can still be searched for. An interrupted firmware update can require JTAG recovery.

Connects one six-button Sega Mega Drive or Genesis controller to both C64 or C128 control ports with port switching and extra button mappings.

For this system (exact model): BackBit's open-source index explicitly names the C64 and C128. The public V2 operation report is centered on the C64, so software-specific alternate-port and keyboard-equivalent behavior should be confirmed on the intended C128 program.

BackBit says it no longer has capacity to build this former product and has released the design under GPL-3.0. The repository supplies KiCad board and schematic files, CUPL source, printable case files, and a bill of materials; a build also needs the listed ATF1502 CPLD and an ATDH1150USB programmer. The former store URL returned 404 twice, including after the required 60-second retry.

Provides 1 MB or 4 MB of geoRAM-compatible cartridge memory for the Commodore 64 and 128.

For this system (exact model): Both project pages explicitly name the Commodore 128. GGLABS states that its example read and write code works in C64 and C128 modes; confirm that the intended C128 software supports geoRAM and the selected capacity.

GGLABS marks both technical projects released, but the current GRAM/4D Tindie listing says the seller is taking a break and no current GRAM/1D order path was verified. The published pages are useful technical documentation but do not expose a complete fabrication package. GeoRAM-aware software is required. GEOS 2.0r can use at most 2 MB; the full 4 MB needs patched GEOS 2.0r+, GEOS MP3, Wheels, or another compatible program.

Modern VIC-1011A-style user-port adapter with a DB9 RS-232 connection for the Commodore 64 and 128.

For this system (exact model): The seller explicitly lists the C128. Follow the maker's jumper and software instructions rather than assuming that every C64 UP9600 configuration applies unchanged.

The Tindie seller was taking a break on 2026-07-30 and did not expose an ordering path. GGLABS publishes a schematic for the current revision, but the page does not present a complete fabrication and assembly package.

Expansion-port UART family with SwiftLink-compatible GLINK232 and faster Turbo232-compatible GLINK232T forms.

For this system (exact model): GLINK232 supports the SwiftLink table through 38400 baud. The maker tested GLINK232T at 115200 baud with DesTerm 3.02 in 80-column mode. Rates above 38400 leave very little processing time and work reliably only in selected configurations; the seller recommends fast mode or an accelerator for the highest rates.

GLINK232 A03 remains buildable from its schematic, Gerbers, and component-option tables. The faster assembled GLINK232T was unavailable while its Tindie seller was taking a break on 2026-07-30, and its page does not provide a complete fabrication package. The seller text misprints the top T rate as 203400 baud; the maker's overview and register table specify 230400 baud.

User-port USB serial adapter for linking supported Commodore 8-bit computers to a modern host's virtual COM port.

For this system (stated family): The seller explicitly lists the C128, C128D, and C128DCR. This catalog target groups those systems.

The Tindie seller was taking a break on 2026-07-30 and did not expose an ordering path. GGLABS publishes a schematic, but the page does not present a complete fabrication and assembly package.

Current FPGA replacement for MOS 6526 and 8521 CIA chips with selectable old- or new-CIA behavior.

For this system (exact model): The maker tested C128 operation in 1 MHz and 2 MHz modes, including CP/M and disk-drive burst mode. One C128 CIA position is rotated relative to the other, so match the module's pin-1 mark to the motherboard rather than copying the adjacent chip's orientation.

The official project page links multiple current retailers, and AmericanRetro exposed a direct Buy Now route on 2026-07-30. The maker says the implementation passes its diagnostic and software suites but explicitly warns that a reproduction cannot be guaranteed identical under every hardware and software combination. Clockwork64's maker separately reports problems with J-CIA replacements.

Vintage and DIY C64 freezer cartridge that saves restartable memory snapshots to disk, tape, or EPROM-oriented cartridge files.

For this system (exact model): ReplayResources documents early C128 incompatibilities and a later ROM update reported to resolve them. The archive cannot establish whether that means Capture 1.1, Capture II, or both. Treat C128 use as version-specific C64-mode compatibility and identify and test the installed ROM rather than assuming every original or Re-Capture image works.

DDI's Re-Capture page still exposes Gerbers, a parts list, a Capture ROM archive, and a manual link. The parts list specifies the EPROM, SRAM, logic, passives, and switch choices, but ReplayResources says the schematic is still missing and no complete assembly or test guide was found. Neither page supplies a clear license for the reproduction files or Capture software. ReplayResources quotes permission relating to Jason-Ranheim's separate Promenade materials but explicitly says its own Capture permission requests went unanswered, so the catalog does not treat the Capture ROM as open or freely licensed. Original cartridges remain worth searching for used.

Licensed replacement computer and disk-drive ROM system that accelerates Commodore serial storage and adds DOS commands.

For this system (exact model): The official description and installation archive cover C128 and C128D variants. Match the computer ROM and any physical-drive ROM to the exact hardware revision.

The official licensing site listed five authorized sales channels on 2026-07-27. Offerings include licensed ROM images, replacement ROM overlays, and switchless overlays; stock and the exact supported machine or drive vary by seller.

Adds about 1.7 meters of reach between a compatible nine-pin controller and its vintage computer.

For this system (exact model): AutumnHippo explicitly lists the C128. Shared connector shape does not make controllers from all other listed systems interchangeable.

AutumnHippo exposed an add-to-cart route at USD 7 on 2026-07-30. Protovision separately showed ten joystick extension cables in stock at EUR 10 with a one- to two-week shipping estimate. The exact long and short products pictured by the C64 OS guide are not identified, so the catalog keeps current length and seller variants together.

Provides a new 1.7-meter nine-conductor lead for repairing compatible vintage joysticks and controllers.

For this system (exact model): The seller explicitly lists C128 controllers. Copy the original controller wiring and verify continuity before connecting it to the computer.

AutumnHippo exposed an add-to-cart route at USD 7 on 2026-07-30. Basic soldering is required. Trace the existing cable or controller circuit before removal: the seller explicitly warns that wire colors can differ and that systems sharing a nine-pin plug do not necessarily share controller wiring.

Protected regional replacement supplies for the C64, later VIC-20, and C128 in Classic, Modern, and current RetroPower enclosures.

For this system (exact model): Choose a C128 electrical variant with the rectangular five-pin output and 5 VDC 3 A plus 9 VAC 1.1 A ratings. The public pages do not distinguish flat C128, plastic C128D, and metal C128DCR chassis, so confirm an external-supply connection exists on the exact machine.

Keelog's current family pages listed regional C64 and C128 supplies on 2026-07-30. Representative EU Classic or Modern products were USD 65.99 or EUR 57.99. Classic measures 86 by 70 by 48 mm; Modern measures 125 by 59 by 42 mm, with black and gray choices. Keelog also identifies RetroPower as the successor enclosure. Match the computer branch, connector, mains voltage, and regional plug rather than selecting by case style alone.

A repairable metal-cased C64 replacement supply with fused 5 VDC and 9 VAC sections, a power switch, and optional C128 or Plus/4 adapters.

For this system (exact model): C128 use requires the separately priced pigtail adapter. The public articles do not distinguish flat C128, C128D, and C128DCR chassis or document the adapter pinout, so confirm the exact computer and cable with the maker.

The newest readable announcement was published on April 18, 2022 and listed the Nu-Brick 64 at USD 65 plus USD 15 shipping, with C128 and Plus/4 pigtail adapters at USD 15 each. It directs buyers to message Kevin Ottum on Facebook. No current stock or price page was verified on 2026-07-30, so confirm that he is still accepting orders and specify the required computer and connector.

Open microSD cartridge that emulates many C64 and C128 cartridge formats and loads programs and disk images.

For this system (exact model): The current project explicitly supports PAL and NTSC C128 systems plus C128 generic cartridges and WarpSpeed 128. Model-specific timing can still require adjustment, and the seller's assembled firmware choice should be confirmed before ordering.

Retro Electronics listed one assembled cartridge in stock on 2026-07-25 without a microSD card. Lotharek also exposed a current order path on 2026-07-27 for a redesigned board in a transparent case. Retro Electronics installs Version 1.35 by default and treats its NTSC build as work in progress; check the current Codeberg releases before use.

Open SwiftLink-compatible expansion-port UART design for connecting supported Commodore computers to DB9 RS-232 equipment.

For this system (stated family): The maker explicitly lists the C128, C128D, and C128DCR. Link232 needs an open cartridge slot, compatible SwiftLink software, and a suitable DB9 cable.

RETRO Innovations does not sell assembled Link232 cartridges. The maker publishes EAGLE schematic and PCB files for builders. A separately mentioned future Turbo232-compatible revision has no documented release and is not part of this record.

Combines a SwiftLink-compatible high-speed serial cartridge with an ESP8266 Wi-Fi modem for Commodore 64 and 128 systems.

For this system (exact model): The maker explicitly supports the Commodore 128 and names Desterm and Centipede 128 among tested software. A documented DTR setting may need to be disabled for downloads in some C128 terminal programs.

The assembled Tindie listing was retired by 2026-07-30. The project repository retains Eagle design files, case files, firmware, software patches, and setup documents. The maker says prebuilt units sometimes appear through the linked eBay seller page, but no specific current listing was verified.

Adds a hardware azimuth indicator to a Commodore 1530 Datasette so its tape head can be aligned without running a program.

For this system (exact model): Shareware Plus explicitly names the Commodore 128 with the C2N 1530 reproduction. The retained sources do not distinguish flat C128, C128D, and C128DCR configurations; compatibility is through the supported external Datasette rather than an internal computer modification.

The GPLv3 reverse-engineering files remain available. Shareware Plus described a small reproduction batch at GBP 16, with an optional GBP 6 brass adjustment rod and GBP 5 printed support, but that page was last updated on 2025-01-01 and uses email ordering. Confirm present stock and exactly which parts are included. Installation modifies a Datasette and requires soldering to points that can differ between PCB revisions.

Adjustable VIC-IIe interposer intended to reduce jail bars, color stripes, and S-Video checkerboarding on a Commodore 128.

For this system (exact model): The designer announcement explicitly identifies the C128 and C128D, while the current product listing names the C128. The board affects the VIC-IIe 40-column composite and S-Video path, not the 80-column RGBI output. Shareware Plus warns that some metal-case 128D computers need the included riser socket; exact C128DCR fit is not yet established.

Protovision listed four units in stock at 33 EUR with a one-to-two-week delivery estimate on 2026-07-30. Shareware Plus also offered email ordering at 28 GBP plus postage on a page updated in August 2025. Installation and adjustment are not necessarily drop-in: a metal-case 128D may need the supplied additional IC socket to clear a taller nearby capacitor. Human review found no revision-specific installation sheet, so exact plastic C128D and C128DCR shield, heatsink, capacitor, and switch clearance remain unverified.

Emulates Commodore IEC devices and loads files from local flash, an SD card, or network servers over Wi-Fi.

For this system (exact model): The project repository explicitly names the Commodore 128. Meatloaf uses its IEC serial bus for virtual drives and other devices; builders must choose matching ESP32 hardware and firmware.

The project provides source, several ESP32 hardware profiles, build instructions, and a browser-based firmware flasher. No direct retail source was verified, so builders must select matching hardware and firmware before connecting it to a computer.

Converts composite, S-Video, RGB, RGBI, and VGA-family retro signals to simultaneous digital and analog DVI-I output.

For this system (exact model): The current wiki recognizes C128 RGBI/PAL through Revision B's digital DB9 input and says a standard straight-through DB9 cable carries signals in the matching order. The computer's separate 40-column analog output needs a different compatible input path.

The European SCART and Japanese JP21 Revision B pages exposed login-or-register-to-buy paths on 2026-07-27. Never connect an EU SCART cable to the JP21 version: the seller says the different pinout can damage the device. The newest dated hardware announcement says units made since June 2025 have a larger OLED and USB-C power, but an older section still says Micro-USB. Human review found no package clarification, so confirm the connector, power requirement, and included USB items with the seller. A DVI-to-HDMI cable and source-system cables are sold separately. Medusa line-doubles when needed but does not change vertical refresh rate, so the destination display must accept the resulting 50 or 60 Hz signal and may blank briefly when the source changes resolution. Install only firmware matching the hardware revision.

Connects a PS/2 mouse to Commodore, Amiga, Atari ST, and Atari 8-bit computers with host-specific mouse, joystick, paddle, and tablet modes.

For this system (exact model): Default mode emulates a 1351 mouse and supports the wheel in compatible software. Forced modes include NEOS mouse, digital joystick, Amiga mouse, paddles, and Koala Pad. The computer must have a working SID analog-input path.

The official shop listed immediate delivery from EUR 34.07 on 2026-07-30. Protovision listed five units from EUR 38, with the slim connector costing EUR 3 more. The slim version fits every supported computer; the wider screw-in version has documented clearance exclusions including the Amiga 600 and Atari 1200XL. A USB mouse works only if the mouse itself supports the PS/2 protocol through a passive adapter.

Compact two-connector cartridge-port expander with an upright slot and reset button for C64-family computers.

For this system (exact model): The current Mini X-Pander+ listing explicitly names the C128 and C128D. Only combine cartridges that can coexist at different address ranges.

Protovision showed 12 Mini X-Pander+ units in stock with a one-to-two-week shipping estimate on 2026-07-27. The seller explicitly says it is not compatible with the 1541 Ultimate 2. Two enabled cartridges must use compatible bus signals and different address ranges.

Combines an integrated MIDI interface with five cartridge-resident SID music applications for sequencing, synthesis, drums, and low-fidelity sample playback.

For this system (exact model): The official availability and FAQ pages explicitly support the C128 and C128D. Confirm the required C64-mode startup and cartridge procedure for the exact computer, and use compatible storage and pointing devices.

The official contact page reported MSSIAH in stock on 2026-07-28, and its online order workflow was live. The cartridge and software are one integrated product: its MIDI hardware cannot be used by other applications, no MIDI OUT is provided, and the ROMs are not sold separately. A monitor is effectively required, and saving needs a compatible drive or separate Savyour.

Current flashable C64 freezer and development cartridge compatible with Retro Replay, Action Replay, and Nordic Power ROMs.

For this system (exact model): The current shop explicitly supports a C128 in C64 mode. The cartridge does not force that mode: enter GO64 or hold the Commodore key during startup. It does not provide C128-mode freezer or monitor functions.

individual Computers marked Nordic Replay available for immediate delivery on 2026-07-30 as a fully assembled and boxed cartridge with the Retro Replay ROM pre-flashed. iComp supports the hardware but not the third-party ROM software. Action Replay compatibility does not supply an Action Replay ROM license; the maker says an owner may use an image from an original cartridge. The accessory connector is documented only for compatible devices such as Silversurfer, RR-Net, and MP3@64, and the technical page warns that incorrectly fitted hardware can short and destroy both devices.

Cycle-exact Commodore 1541 disk-drive emulation using a Raspberry Pi and SD-card disk images.

For this system (exact model): The official project explicitly supports the C128 through its IEC serial bus. Supply the Raspberry Pi, SD card, serial cable, legal drive ROM, and adequate external power.

Retro Electronics listed one assembled Option B Pi1541 Hat in stock on 2026-07-25. The Hat is the only supplied part; add a supported Raspberry Pi, SD card, serial cable, legal drive ROM, quality USB cable, and at least a 2.5 A power supply. The official project does not support Raspberry Pi 4 or 5.

Converts composite or S-Video from a C64 or C128 to selectable-resolution analog VGA output.

For this system (exact model): The review tested the 40-column output of a flat C128 and a C128DCR. The flat C128 looked good over S-Video; the C128DCR looked poor over S-Video but good over composite. The scaler does not accept the separate 80-column RGBI output.

The exact Portta scaler was documented in a 2016 hands-on review, but no current maker product page or stable new-stock source was verified in 2026. The unit includes a short USB-A power cable but no power supply or computer-specific video cable. Results varied by computer: the reviewed flat C128 looked excellent over S-Video, a C64C showed vertical banding and a rainbow border, and a C128DCR produced poor S-Video but good composite output.

Compact cartridge-port prototyping PCB and breadboard-bridge kit for C64 hardware development.

For this system (exact model): The version 2 page explicitly names the Commodore 128, but supplies no chassis, C64-mode, clearance, or electrical qualification. Treat this as an expansion-port development relationship, confirm the exact C128 configuration with the seller, and do not assume that the earlier C64 kit page independently supports every C128 model.

Both email-order pages were last updated on 2025-01-01. The kit page then claimed stock, while the version 2 page gave no price or stock quantity. Neither page exposes a checkout route, pin map, schematic, design files, license, board-revision comparison, protection details, or complete included-parts list for a bare version 2 board. Confirm current availability and the exact PCB revision and package before ordering.

Uses a Raspberry Pi cartridge to emulate up to 16 MB of REU memory or up to 4 MB of GeoRAM-compatible memory on a C64 or C128.

For this system (exact model): The maker tested PAL and NTSC C128 systems and a C128D. External Raspberry Pi power is strongly recommended; never connect computer and external power simultaneously. Expansion-port timing or attached expanders can require configuration changes and may still cause glitches.

Retrobit listed five assembled cartridge boards with cases at PLN 93.50 on 2026-07-27. A Raspberry Pi Zero 2 W and microSD card are not included. The upstream project describes RAD as a playground for new features and documents machine-dependent timing and power limitations.

Custom replacement supplies ranging from simple C64 units to multi-connector systems for several Commodore computers and drives.

For this system (exact model): The preserved feature explicitly covers the C128 and illustrates P64-128, M64-128, M64-128 2D, and M-AM-64-128 examples. Standard C64/128 orders used a Y cable with both computer connectors, but separate cables or adapters could be requested. Confirm whether a specific unit is intended for one computer at a time or for simultaneous loads.

The readable C64 OS feature was last modified in September 2022 and gave a USD 35-100 range for standard examples, with more elaborate custom builds possible. It directed orders and inquiries to Ray Carlsen by email. Both linked maker pages failed Tavily extraction and failed again after the required 60-second retry under WF-066 and WF-067, so current ordering, prices, model names, electrical ratings, protection, and mains options must be confirmed directly. Do not transfer the specifications or simultaneous-device behavior of one custom build to another.

Converts NTSC composite video and analog audio from an Apple II or Apple III to an HDMI display.

For this system (bus/interface): Use the NTSC C128 40-column composite output with a computer-specific cable. The adapter does not accept the separate 80-column RGBI output, ReActiveMicro does not name or test the C128, and PAL use is untested.

The adapter was in stock and backorderable for $45 on 2026-07-30. It was not tested or intended for PAL systems. Simultaneously connecting a CRT and this adapter requires a composite impedance-matched switch box or video may degrade or disappear. The package includes generic composite, HDMI, audio-adapter, and power cables, but not a computer-specific Commodore A/V cable.

Current handmade composite, S-Video, SCART, and luma/chroma cable choices for compatible Commodore computers.

For this system (exact model): The seller explicitly lists the C128. These cables handle its 40-column analog A/V output and do not carry the separate 80-column RGBI signal.

AMI64 exposed current priced choices on 2026-07-30. The eight-pin S-Video branch includes a 300-ohm chroma resistor. Connector, signal, and display requirements differ between variants: select a five-pin composite lead for an early C64 or VIC-20, and use the eight-pin luma/chroma branches only with a computer and display that expose those separate signals. The seller describes PAL and NTSC use, but the connected display must still accept the computer's regional video standard.

Current ZiModem-based Wi-Fi modem for Commodore 64 and 128 BBS access, Hayes commands, and incoming connections.

For this system (exact model): The product page explicitly names the Commodore 128. The seller documents terminal dialing, listener mode, and firmware updates for this modem family.

Retro Rewind accepted orders with a displayed 2-3 day fulfillment estimate on 2026-07-30. Suitable terminal or BBS software is still required.

Open 90-degree cartridge adapter that brings a C64 cartridge upright and can include a reset button.

For this system (exact model): A completed seller run explicitly offered and tested the same design on the C128. Confirm cartridge mode support and case clearance for the attached device.

Sordan exposed an assembled C64 unit with a printed case and stand for dispatch in one to three working days on 2026-07-27. The open repository also provides fabrication files and a printable-enclosure link. A completed 2024-2025 seller run offered bare, kit, and assembled versions tested on C64 or C128 systems.

Line-doubles standard-definition composite, S-Video, or component video for modern digital displays with no added latency.

For this system (bus/interface): Use the C128's 40-column composite or S-Video A/V output with the appropriate cable. The RetroTINK-2X does not accept the separate 80-column RGBI output.

The original RetroTINK-2X is a retired predecessor; the current 2X Pro was orderable for $139.99 on 2026-07-30. It accepts only 240p, 288p, 480i, and 576i and does not accept 480p or higher input. Supply the correct source-system cable, a digital video cable, and a 5 V / 1 A USB power source; a Micro-USB cable is included. RetroTINK warns that composite sources can produce low output and recommends S-Video or component when available.

Adds a switch-selectable 256 KB to 16 MB DMA RAM Expansion Unit compatible with Commodore 1700, 1750, and 1764 software.

For this system (exact model): The maker explicitly supports the C128 and C128D. REU Grande implements the programming interface used by Commodore 1700, 1750, and 1764-compatible software.

RETRO Innovations exposed an Add to Cart path at $75 on 2026-07-27. A dated 2026-04-29 notice on the product page says red enclosures were temporarily unavailable and orders could take two to three weeks to ship, so confirm the current enclosure and fulfillment state when ordering.

Replaces the RF modulator in supported C64 and C128 systems to improve composite and S-Video output and add configurable rear connections.

For this system (exact model): The seller offers a Commodore 128 version and requires the buyer to select the machine variant. The page does not explicitly establish C128D or C128DCR compatibility, so confirm the exact motherboard and enclosure before purchase. The maker recommends a new heatsink for the C128 VDC.

The Lectronz page showed four units in stock at USD 34.17 on 2026-07-27. Machine-specific versions and optional luma-bypass parts are selected before ordering. The seller also reported that shipping to the European Union was temporarily unavailable while Australia Post updated its duty systems.

A buildable C128 and IBM CGA digital-to-analog video adapter with RGBS, RGBHV, and Commodore A/V pass-through options.

For this system (exact model): Build the full Commodore configuration and connect both the RGBI and A/V paths for 80-column conversion plus 40-column video and audio pass-through. Do not fit or power the external barrel input while the C128 A/V power connection is in use.

The repository publishes KiCad sources, Gerbers, a BOM, and printable cases for revision 1.3. The maker tested RGBI, composite, S-Video, audio, and GBS-Control output; revision 1.3 corrects the earlier monochrome pass-through error. This is not a scan converter. Use a compatible 15 kHz path such as GBS-Control or a suitable SCART converter. Never connect the C128 A/V power input and the external barrel power input at the same time. The maker found an ordinary SCART-to-HDMI box unstable in one 80-column game while GBS-Control remained stable.

Compact, low-power C128 VDC video-memory expansion built around one 64 KB static RAM chip.

For this system (exact model): Poly.play explicitly lists the board as a VDC RAM expansion for the Commodore 128(D), and Protovision names the C128. Do not confuse this with a main-memory expansion or assume that a C128DCR, which normally already has 64 KB of VDC RAM, needs it.

Poly.play listed the pxlmod board as out of stock on 2026-07-30. An older Protovision order link now reports that the product is not found, so check Poly.play for a restock. Current wording names the Commodore 128(D) without separating plastic C128D from metal C128DCR; the latter normally already has 64 KB of VDC memory.

Retired family of SD-backed SCSI drive emulators that includes internal 50-pin and direct-attach DB-25 hardware.

For this system (bus/interface): A documented C128 workflow replaces an original CMD HD mechanism with SCSI2SD v5.1. The adapter remains inside the separate CMD HD; configure it for the controller and back up every partition before replacing the original disk.

Upstream describes SCSI2SD V5 and V6 as permanently retired. SamplerZone nevertheless exposed an Add to Cart path for a cased v5.5 at $129.95 on 2026-07-27, including configured microSD media and optional HD50 or Centronics-50 adapters. Treat v5.1 as a used-market mechanism upgrade and confirm reseller fulfillment for v5.5. The documentation hub lists v4.8.4 from 2019 as the latest firmware for both versions. V5.5 has fixed termination and must be last on its chain; hosts without DB-25 termination power need USB power.

Family of IEC storage devices that lets supported Commodore computers access files and disk images on SD or other removable media.

For this system (exact model): The Endresz hardware guide and open SD2IEC LP documentation explicitly list the C128. Use a unique IEC device number when another internal or external drive is present.

Retro Lemon listed its user-port-powered C64, C128, VIC-20, and SX-64 variant in stock at GBP 34.17 on 2026-07-27, and Sordan exposed a current Buy now path for its combined SD2IEC and Tapecart variant. PolyPlay's plain external Sordan Micro device and Retro Electronics' internal board were out of stock, while the RetroFletch backplane seller was on a break. A complete open C64 SD2IEC LP hardware build is also available. Variant power, connectors, controls, and firmware configuration differ. The official firmware site says 0.x firmware is obsolete and warns that newer-dated bootloaders are not necessarily safer or better.

Safely connects a Sega Mega Drive or Genesis controller to a Commodore 64, Commodore 128, or Amiga with configurable fire and jump mappings.

For this system (exact model): Gotek Retro explicitly names the C128 for its assembled variant. Use its C64/128 setting and configure each Fire or Up function only once.

The open CERN OHL 1.2 project supplies design and fabrication files plus a bare-PCB ordering route. On 2026-07-30, Gotek Retro listed its assembled C64/128 and Amiga adapter at EUR 15 and AMI64 listed its assembled C64 and Amiga adapter at GBP 20. Turn the computer off before changing selectors, choose the correct computer mode, and assign each function only once. The open and AMI64 versions may need a joystick extension cable at an Amiga 600.

Assembly kit that adds a numeric track or sector display to supported Commodore floppy drives.

For this system (bus/interface): The detailed installation report covers 1541, 1541C, 1541-II, 1571, 1581, C128D, and C128DCR drive variants. The current retail package names only the 1541 and 1541-II, so confirm the supplied EPROM and instructions for any other drive.

Commodore4ever and Protovision both exposed current-priced product pages on 2026-07-27, but neither extraction exposed an unambiguous Add to Cart control. Confirm availability before ordering. The kit requires through-hole assembly, display wiring, and internal drive installation; stacked boards or sockets can create clearance problems.

Adds 512 KB of bank-switched geoRAM-compatible cartridge memory to a Commodore 64 or 128.

For this system (exact model): The maker explicitly names the Commodore 128. Confirm that the intended program and operating mode support geoRAM memory rather than a 17xx REU.

The Shareware Plus page was updated on 2026-01-01 and says the cartridge is in stock by email order. Protovision also maintains a current product listing, but its extracted page does not expose a stock or checkout control. This is geoRAM memory, not an REU; software must explicitly support the geoRAM interface.

Replaces the C64 RF-modulator circuitry while retaining composite and S-Video through the computer's A/V port.

For this system (exact model): The maker's visually rendered list says all Commodore 128 board revisions. The page does not publish a model-specific pinout, clearance guide, or installation procedure, so confirm the exact C128, C128D, or C128DCR board and chassis before desoldering the original modulator.

The current maker page remains online but exposes no price, stock state, or order control. Human inspection recovered a maker compatibility list naming PAL and NTSC Assy 250407 C64 boards and all C128 board revisions; Tavily did not render those list values. A 2020 independent review also tested a SixtyClone Assy 250466, where both composite and S-Video worked. Removing the original modulator and installing Shuriken requires desoldering and soldering. RF output is removed.

Cartridge-port second-SID family represented by current SID Symphony reproductions and a selectable-address 6581 SID Cart.

For this system (exact model): ToTs RETRO explicitly lists the C128, C128D, and C128DCR. Its instructions and software are supplied after purchase. The Shareware Plus page describes an optional internal jumper route for other page signals such as $D7xx on a C128, but that modification is not the basis for the current assembled-product claim.

ToTs RETRO listed its ARMSID-equipped CMD reproduction as made to order on 2026-07-28. Shareware Plus also advertises its chip-less 6581 SID Cart from stock, but that page was last updated in January 2025; confirm that variant before ordering.

Partially assembled internal board for adding a second matching SID chip at $DE00 or $DF00.

For this system (exact model): MSSIAH lists PAL and NTSC C128 compatibility, but its installation manual leaves motherboard-specific details to the owner. Verify socket access, clearance, audio routing, and the second-SID address required by the intended software.

The MSSIAH availability page reported the SID2SID circuit board in stock on 2026-07-28, and its order workflow includes SID2SID. SID chips, audio wiring, and an output jack are excluded. Shareware Plus separately advertises a parts pack without the PCB or SID chips while its remaining stock lasts.

Uses a Raspberry Pi cartridge to emulate memory, sound, cartridges, ROMs, and file-loading functions across several Commodore 8-bit systems.

For this system (exact model): Tested on C128 and C128D systems. KERNAL and SID functions require CPU and SID wiring. C128 Ultimax-mode ROM reads can fail 10 to 20 percent of the time and cause artifacts in older Ultimax games. Never connect computer and external Raspberry Pi power simultaneously.

The open project publishes Gerbers, BOMs, software, and case files for full-size and Zero boards. Retro-Updates' assembled Sidekick64 Zero was out of stock on 2026-07-27 and excludes the Raspberry Pi Zero 2. The maker calls the project a personal playground and warns that unsupported images, timing glitches, and unsafe cartridge combinations remain possible.

Adds one or two original SID chips with automatic model detection, selectable mono or stereo addressing, protected power, and a dedicated stereo output.

For this system (exact model): The maker lists the C128, C128D, and C128DCR and supplies longer cables for these cases. The $D500 second-SID address is unavailable on a C128, so software and configuration must use another supported address.

The official site reported the SIDFX bundle sold out on 2026-07-27 and says no more modules will be manufactured after its limited stock is exhausted. The separate C64 Reloaded MK1 and MK2 adapters are accessories for this same family and do not replace the unavailable SIDFX module.

DIY RP2040- or RP235x-based replacement for one or two 6581 or 8580 SID chips, with optional FM emulation and paddle or mouse input support.

For this system (exact model): The project explicitly supports the C128 and provides configuration from C128 mode. Address $D500 is unavailable, multi-SID or FM use requires signal wiring, and a C128D may need removal of a power-supply support bolt for interface-board clearance.

Choose the hardware design and matching firmware together. The official project documents different DAC, PWM, connector, line-output, and host-interface arrangements plus a list of preassembled sellers. Multi-SID or FM modes need the documented address-signal wires. Never power the module from USB and the Commodore computer at the same time.

Internally powered user-port adapter family for connecting a Commodore 64 or 128 to DE9 RS-232 equipment.

For this system (exact model): The standard version supports the C128 through 2400 baud. The UP9600 version can work, but it interferes with Burst Mode and therefore cannot be used alongside 1571, 1581, CMD, or other Burst Mode drives.

The product page marked the adapter out of stock on 2026-07-30. Grey, black, and white enclosures and the two speed configurations remain one functional product family. The modem, passive DB25 converter, and serial or null-modem cables are separate.

Historical MOS 8701 replacement with automatic PAL or NTSC selection and an onboard switchable oscillator.

For this system (exact model): The maker explicitly lists the C128. The source does not distinguish the C128, C128D, and C128DCR or document their individual clearances, so confirm the exact board, socket, and available height.

The maker's August 2021 AmiBay thread said that only a few units remained, and the thread is now closed. No current direct order path was verified. Inspect a used board for its solder-bridge configuration before relying on automatic motherboard selection.

Internal stereo SID card sold for several C64-family computers with a connection cable and configuration jumper.

For this system (exact model): The seller explicitly lists the Commodore 128 and 128D. No public instructions establish mode-specific addressing, internal fit, or whether any C128-family revision needs different wiring.

poly.play and human review reported the card out of stock on 2026-07-28. HR-056 found no additional public setup information, so confirm the required SID chips, addressing, voltage configuration, and installation procedure before obtaining old stock.

User-port Wi-Fi modem for connecting a Commodore 64 or 128 to Internet BBS services.

For this system (exact model): The seller explicitly names the C128 and connects the modem through its user port. The supplied ESP8266 is preconfigured for 9600 baud.

Retro Electronics listed two assembled modems in stock on 2026-07-25. The ESP8266 is flashed and configured, but terminal software and the separate device needed to load it are not supplied.

Adds a live track, density, write-protect, motor, and sync display to supported Commodore floppy drives.

For this system (bus/interface): The tracker supports 1541-family drives and the 1571. A 1571 requires the 6522-included version soldered in place of the original VIA, with the OLED mounted externally.

The standard and 6522-included variants were both out of stock on 2026-07-24. The 1541-II and 1571 require the special version with a 6522 VIA soldered to the tracker board; the standard version will not work in those drives. Installation can require desoldering the original VIA, fitting a socket, and mounting the display and button externally.

Installs inside supported Commodore floppy drives to duplicate protected disks and add disk utilities.

For this system (bus/interface): The broader Supercard+ version supports the 1571 as well as 1541-family drives. Installation is inside the drive and may require desoldering its 6502.

Both assembled variants were out of stock on 2026-07-24. Each listing includes a 40-pin socket and version 6.0 software on two 5.25-inch disks. Some drives require desoldering the 6502 and installing a socket, so identify the drive model and board revision before ordering or installing.

Connects as many as eight standard SNES controllers to a Commodore 64 or 128 through its two control ports.

For this system (exact model): Poly.play and C64 OS explicitly list C128 use, and C64 OS also names the C128D. The sources do not establish C128DCR scope. Compatible software must scan the adapter protocol.

Poly.play listed the adapter at EUR 45 but marked it out of stock on 2026-07-30. Controllers are separate; the store's current third-party SNES pad is a commodity accessory and remains folded into this record. Poly.play's short description incorrectly says user port, while the linked original wiring document and C64 OS technical explanation both say that SuperPad64 occupies the two control ports and leaves the user port free. Confirm the supplied connector arrangement with the seller before ordering a future production run.

Host-specific C64 and C128 breakouts with open eight-pin designs plus an assembled five-pin option for early C64 boards.

For this system (exact model): Use Sven Petersen's dedicated C128 board so the adapter does not block the adjacent IEC port. This is a breakout for the 40-column composite and S-Video A/V output; it does not convert the separate 80-column RGBI port. The repository does not separately document C128D or C128DCR case clearance.

Retro Rewind listed the assembled eight-pin C64 version, while Commodore4ever listed both eight-pin and early five-pin C64 versions on 2026-07-30. The open eight-pin C64 and dedicated C128 variants remain buildable from board, BOM, and case files. The standard C64 board physically blocks the IEC port on a C128, so use the dedicated C128 layout there. Optional two-channel output requires a second SID or similar source wired to pin 7; otherwise both output channels carry the computer's mono audio.

Open five-board set for bringing Commodore cassette, user-port, and PET IEEE-488 connections to headers and ribbon cables.

For this system (exact model): The repository explicitly names the C128 for the cassette breakout and user-port output. It does not distinguish flat C128, C128D, and C128DCR clearance or document protection, so verify the exact connector, orientation, and cable before applying power.

The public repository provides revisioned PCB project files, pictures, and a GPLv3 license, but no current assembled seller is documented. Builders must fabricate the required board pair, fit connectors, and make the matching ribbon cable. The concise README does not document buffering, isolation, fusing, current limits, or a safe live-connection procedure; verify orientation and wiring and make every connection with the computer powered off.

Adds an internal SwiftLink-compatible ESP8266 Wi-Fi modem to the flat-model Commodore 128 while leaving its cartridge port available.

For this system (exact model): The maker explicitly limits Swift-L to the flat Commodore 128. It reuses a 6526 CIA and requires dot-clock and address flying leads; DE00, DF00, and D700 are documented. The source conflict over whether the interposer belongs at U4 or U2 must be resolved before installation.

The assembled Tindie listing was retired by 2026-07-30, while the open project retains hardware and firmware material. The archived Tindie instructions specify socket U4, but the maker's merged README says U2, and human review found no surviving material that resolves the conflict. Do not install from the catalog summary; inspect the project files and verify the correct CIA socket against the exact board.

Adds an internal SwiftLink-compatible ESP8266 Wi-Fi modem to supported Commodore 64 longboards and Commodore 128DCR systems.

For this system (exact model): The maker README explicitly supports the C128DCR form, where the board fits at U1 and uses three flying leads including NMI. This does not establish compatibility with the flat C128 or other C128 case and board revisions.

The assembled Tindie listing was retired by 2026-07-30. The open project retains Eagle design files, firmware, patches, and installation material. This is a board-specific internal installation that requires removing and reusing a 6526 CIA plus routing flying leads; verify the motherboard revision and instructions before fitting it.

Combines ROM and program loading, MIDI, Ethernet, NFC launching, remote control, a real-time clock, and REU functions in a Teensy 4.1 cartridge.

For this system (exact model): The maker and seller support C128 machines and both NTSC and PAL operation. Ethernet modem use supports C128 terminal software, while cartridge and loading behavior depends on the selected C64 or C128 operating mode.

The maker's Lectronz store showed six fully assembled revision 0.4 units at USD 64.00 on 2026-07-27. The programmed Teensy 4.1 and case are included. A CR1225 battery is included only with United States shipments, and an SD card or USB drive is needed for content beyond the built-in files.

Historical low-power MOS 8701 replacement with separate PAL and NTSC versions and an onboard oscillator.

For this system (exact model): The maker explicitly sold TOLB for C128 computers and designed its physical size around a C128 installation. The surviving source does not separately document C128D or C128DCR clearance, so confirm the board, socket, variant, and available height.

The original AmiBay sales thread is closed and its seller account has been deleted. No current direct order path was verified. TOLB was sold in separate PAL and NTSC versions, so identify the fitted variant and motherboard video standard before installing a used unit.

Connects USB HID mice, keyboards, joysticks, and gamepads to Commodore, Amiga, and Atari ST-family control ports.

For this system (exact model): Rev3 has a C128 mode that emulates a 1351 mouse and also translates supported HID controllers. Sordan labels mouse use as GEOS-only. The Rev3 manual does not require the C128 extension used by the C64, but the DB9 side must still be connected while powered off.

Sordan hosts current Rev3 and Micro Tom pages and a Rev3 manual, but neither product page exposed a price, stock value, or product-specific cart route on 2026-07-30. AMI64 listed TOM 2+ at GBP 40 but out of stock. TOM+ and TOM Rev2 are retained as older variants rather than presumed current products. USB peripherals may be hot-plugged, but the DB9 adapter must be connected only while the old computer is powered off. Device compatibility is not universal.

A modified SNES-style controller with a nine-pin Commodore plug and a software-read serial button protocol.

For this system (exact model): Poly.play sells the controller in its C64/128 hardware category and explicitly describes its nine-pin connector for Commodore 64/128. Software still needs explicit Trap Them Controller support.

Poly.play listed the stand-alone controller at EUR 15 and the game-and-controller edition at EUR 35, but both were out of stock on 2026-07-30. The linked Poly.play technical wiki returned 404 and then returned the same 404 after the required 60-second retry; the dead URL is recorded in the research registry.

Cassette-port interfaces that load tape audio from a phone, tablet, or other player into supported Commodore computers.

For this system (exact model): The current uCassette page explicitly lists the C128. Cassette operation is subject to the computer's operating mode and loaded software.

AMI64 exposed an active Add to Cart listing on 2026-07-27. The page documents audio playback into the computer but does not claim that this interface can record or save tape output.

Adds USB-backed disk-image storage, drive emulation, networking, and other emulated peripherals to Commodore 64 and 128 systems.

For this system (exact model): The official FAQ says Ultimate cartridges work on the C128, C128D, and C128DCR with limitations. An internal drive may already occupy device 8, so configure a different device number or follow the documented internal-drive procedure. The FAQ author reports that procedure worked on a C128D.

The official store showed several Ultimate-II+L color variants in stock on 2026-07-15, with some colors on back order. On 2026-07-27 its home page said new orders include the Wi-Fi module, but it also retained an outdated February 2026 restock notice; verify the selected variant before ordering.

Connects modern Bluetooth gamepads and, on selected models, mice to Commodore, Amiga, and Atari computers.

For this system (exact model): The active C64 layout is designed to fit the C64 and C128, and the maker explicitly lists the C128 and C128-D. The current CBMretro assembled version is sold for C64/C128 use. C128DCR clearance is not separately documented.

The official C64, A500, and 800XL Tindie pages were out of stock on 2026-07-30, although the project marks those models active and supported. CBMretro had equivalent cased C64/C128 and A500/A1200 hardware available at EUR 41.90; the original designer does not support third-party builds. Open hardware, firmware, and documentation remain available. The guide's original Unijoysticle tile is folded here as the retired WiFi predecessor: it needed a separately powered ESP8266 receiver and phone or desktop client, unlike the Bluetooth successor.

Provides a menu-driven utility cartridge or a bare board for building a custom multi-EPROM C64 cartridge.

For this system (exact model): The original complete cartridge is explicitly supported only while the C128 is operating in C64 mode. The bare board has the same cartridge format and requires EPROMs, software, programming, and assembly.

The complete new-old-stock cartridge was out of stock, but bare genuine boards were in stock on 2026-07-24. A bare board includes no case or EPROMs. Building a custom cartridge also requires legally sourced Promos or Promenade Menu Maker software, which CBMSTUFF cannot distribute, plus EPROM programming and assembly.

Open EPROM cartridge board for making single-ROM, switchable multi-ROM, and diagnostic cartridges for the C64 and C128.

For this system (exact model): The project explicitly includes C128 hobbyists, but the loaded cartridge software still determines whether a particular image runs in C128 mode, C64 mode, or both. Do not infer C128-native software compatibility from the board alone.

The repository provides board revisions, fabrication files, and documentation. A working cartridge still requires a PCB, components, a correctly programmed EPROM, and configuration appropriate to the selected ROM images.

Adds Wi-Fi BBS and Hayes-modem access through the user port of supported Commodore computers.

For this system (stated family): The official manual supports the C128 and C128DCR through their standard user ports. This catalog target also groups the C128D.

The standard display-free version and both PET versions were out of stock on 2026-07-30. The standard OLED page still said a new design was pending and did not offer ordering. Check the direct pages for a restock or revised design.

Open cartridge-port expander with three independently controlled positions, configurable bus signals, and a reset switch.

For this system (exact model): The maker explicitly lists the C128 and C128D. Confirm that each cartridge supports the intended C128 or C64-mode workflow and does not conflict with another enabled device.

The official store exposed an active $30 listing on 2026-07-27, and the open Eagle files remain available. Cartridge combinations are not guaranteed, the two connectors at the third position share one set of switches, and the passive bus can worsen marginal signal integrity. Insert, remove, and configure hardware only with the computer powered off.

Compact SwinSID-derived 6581 or 8580 replacement with hardware mode selection and a higher audio-output level.

For this system (exact model): The Tindie product title explicitly includes the C128, but the detailed installation text covers only the C64 U18 socket. Confirm the exact C128 board, SID socket, voltage, and orientation with the seller before purchase.

Tindie showed 10 units in stock at USD 38.88 on 2026-07-28, while AMI64 listed the same family at GBP 49. Tindie's extracted page gave contradictory US shipping information, so confirm destination eligibility before ordering. X-SID does not support paddles or a mouse, and neither seller publishes technical, firmware, or installation documentation.

Bridges a modern computer over USB serial to Commodore IEEE-488 and IEC equipment, or supplies host-backed storage to a Commodore computer.

For this system (exact model): The project explicitly includes the C128 among serial-IEC computers that can use PC-backed storage. Confirm the cable and host software, and correct the documented board-connector footprint problem.

The maintainer explicitly calls XS1541 orphaned and reconstructed its documentation from an archived build guide. The surviving page provides a schematic, firmware, and detailed assembly and flashing steps, but not a turnkey current kit. The original board connector footprints are buggy: the narrow connector can short contacts unless the coding gap is physically corrected. A build also requires fine-pitch FT232RL soldering, ATmega programming, fuse setup, cables, and suitable host software.