Tag: c64

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

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.

Tests major Commodore 64 chips, ROMs, interrupts, controls, and external ports with a cartridge and loopback plugs.

Protovision announced that 64 Doctor was back in stock on 2026-07-21. The product page listed eight units at EUR 35 with a one- to two-week shipping estimate on 2026-07-30. A detailed 2019 review identifies Tim Harris of Shareware Plus as the licensed manufacturer and demonstrates the test sequence, but it does not establish equivalent sound-test behavior for an 8580 or replacement SID, the SX-64, or a C128 in C64 mode.

Small C64 prototyping boards for the cartridge port, user port, or a combined dual-port project.

The email-order page was last updated on 2025-01-01 and then said any combination was available, but it publishes no price, checkout path, schematic, pin map, bill of materials, design files, or protection details. Confirm present stock, the exact board variant, connector and header parts, case fit, and documentation before ordering. Treat every exposed power and signal line as unprotected unless the seller supplies contrary electrical documentation.

Cartridge-port prototyping board with a mini breadboard and jumper leads for building C64 circuits.

Poly.play listed SKU PP0057 at EUR 17 including German VAT but marked it out of stock on 2026-07-30. The page publishes no schematic, pin map, design files, license, buffering, isolation, fusing, current limit, or power-handling specification. Confirm a restock and treat every computer signal and power line as unprotected.

Historical C64 user-port board providing 32 general-purpose input and output connections.

A February 2021 demonstration points to former eBay item 333905309830, but the exact listing failed two Tavily extractions after the required 60-second retry and is logged as WF-065. No current hardware seller, board design package, manual, pin map, electrical limit, protection circuit, or hardware license was verified. Treat the board as a used-market find. The demonstrated LED bank uses 1K resistors and leaves VCC disconnected; that example is not a general electrical specification.

Tested 64K-by-1 4164 DRAM chips for repairing Commodore 64 motherboards that use the eight-chip, 16-pin memory layout.

Both exact product routes were present on 2026-07-30, but Tavily did not expose an unambiguous current cart or stock control on the ToTs RETRO page, and Retroleum was temporarily closed until approximately the beginning of August 2026. Confirm stock before ordering. Match the installed memory organization and motherboard rather than relying on case style: Retroleum explicitly excludes Assy 250466 and C64C boards that use two 41464 or 4464 devices.

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

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 an inexpensive battery-backed real-time clock to a Commodore 64 through the user or cassette port.

The current project page provides version 1.0 software and exact wiring for three C64 connection choices. Gregory Nacu's i2c6502 source independently documents the C64 user-port PB2/PB3 implementation and DS3231 example under the MIT license. A generic RTC module, connector or pass-through board, wire, and battery are separate. Many inexpensive modules include a charging circuit intended for a rechargeable cell; follow the project's component-removal instructions before substituting a CR2032 or CR1225 primary cell. The Timo Voutilainen package does not state a hardware fabrication or software license.

Swaps both Commodore 64 control ports and adds a PS/2 mouse input compatible with 1351-aware software.

Sordan exposed a current Buy now control and says stocked items are ready to ship. The package includes a white 3D-printed case. The seller explicitly supports paddle controllers and says the circuit protects against static while controllers are changed, but does not publish a schematic, supported PS/2 protocol variants, USB-mouse compatibility, connector pinout, or hot-plug procedure.

Open RF-modulator replacement that improves the C64's original luma, chroma, and composite video signals.

Retro Electronics listed one board in stock on 2026-07-25. Installation is an irreversible soldering job that removes the original RF modulator, adds two headers, and solders a ground wire.

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

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.

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.

Current hand-built replacement for the MOS 8701 clock generator in later PAL and NTSC Commodore 64 boards.

CBMretro exposed an in-stock add-to-cart path on 2026-07-30. The page says only that the board is for later C64 models and does not name assembly numbers or the C128. Confirm that the computer actually uses a socketed MOS 8701 and verify orientation before ordering or installation.

Adds a battery-backed DS3231 clock, external LED time display, date display, and timer to a Commodore 64.

The Tindie page listed Clockwork64 at USD 38 but had ordering paused while the seller takes a break through July 31, 2026. It calls this the final batch before retirement, so confirm that an order can still be placed after the seller returns. A CR2032 is included. The maker reports compatibility problems with modern J-CIA replacement chips and directs buyers to version 0.2 of Timo Voutilainen's RTC software.

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

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.

Replaces a missing or failed Commodore power indicator with a prewired round or rectangular LED assembly selected for the case and motherboard layout.

AMI64 listed its red breadbin and C64C choices for GBP 4.95 on 2026-07-30. Poly.play also maintained separate current short and long C64C and breadbin product routes. Retroleum listed original and new round and rectangular assemblies but was temporarily closed until approximately the beginning of August 2026. Color is cosmetic, but LED shape and cable length are not: choose them for the exact case and board position. Confirm current stock before ordering.

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

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.

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

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.

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

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.

Open 1 MB C64 flash-cartridge family that can be reprogrammed directly by the computer without an EPROM programmer.

The EasyFlash and EasyFlash 1CR designs remain buildable. Poly.play's assembled original-style EasyFlash was out of stock on 2026-07-30.

Open C64 flash cartridge with seven EasyFlash slots, eight external KERNAL slots, freezer-cartridge support, and USB transfer.

AMI64 described its assembled EasyFlash 3 as newly available on 2026-07-30. The package includes the cartridge and a printed quick-start guide; a USB cable and any separate C64 storage device are not listed as included.

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

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.

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.

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.

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

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.

Vintage C64 machine-language monitor cartridge with assembly, debugging, memory, and relocation tools.

ConsoleMAD listed one original cartridge-only unit at GBP 24 on 2026-07-30; it was missing its label. RavenWolf's tested USD 12 cartridge was sold out and had been recovered from a workshop with harsh long-term storage conditions. Treat every offer as an individual used item. The HES software and manual remain copyrighted, so this record does not present an unlicensed ROM download as a DIY route.

Rebuilds a Commodore 64 around a modern replacement motherboard with improved power, protection, video, diagnostics, and ROM switching.

CBMSTUFF marks the motherboard discontinued. Its product page, build manual, BOM, and supporting software remain online, and some optional parts remain listed. Used boards may occasionally appear on secondary markets.

Rehouses an original or replacement Commodore 64 motherboard in a newly manufactured C64c shell made with the original injection molds.

Individual Computers listed the Breadbin Gray version for EUR 59.50 and immediate delivery on 2026-07-30. Its explicit variant route also listed a transparent polycarbonate version for immediate delivery. The transparent shell can show small bubbles and surface marks because the original molds were not designed for transparent material. Historical Pixelwizard offerings included Breadbin Gray, Classic Beige, Retro Black, and SX-64 Style cases, but that 2017 range must not be treated as the current color list. The default unqualified product route failed twice under WF-072; use an explicit current variant page.

Replaces the power light with a two-color indicator that shows the computer's IRQ-line state.

Shareware Plus said the C64 breadbin, C64C slimline, and VIC-20 versions were in stock at GBP 9 each plus postage on 2026-01-25 and accepts email orders. The tebl C64 design is buildable under CERN OHL v1.2. This is an IRQ-line indicator, not a complete CPU-usage or disk-activity meter. Installation opens the computer and places clips on cartridge-port ground, +5 V, and IRQ contacts; verify every connection with power off.

Arduino-based C64 cartridge family for fast PRG loading from SD storage or a serial connection.

Gotek Retro lists IRQHack II at EUR 25 including its housing and provides a current order-interest form. The form offers an IRQHack II package with a populated SD card but explicitly has no stock management or availability guarantee and ships only within Europe, with non-EU European destinations handled case by case. Confirm stock and included media before ordering.

DIY replica of the 1985 C64 freezer cartridge that captures RAM, I/O, and CPU state to disk.

The replica repository's 2021 v1.0a files include ISEPIC-named Gerbers, an Altium PCB project, schematic, bill of materials, and disk images. Its README mistakenly links its PCBWay order button to a different 8 MHz Z80 card; do not order that board as an ISEPIC. Review and fabricate from the included ISEPIC files instead. Replica hardware files outside the Docs and Software directories are CC BY-NC-SA 4.0. The original 1985 ISEPIC software remains copyrighted and is not covered by that hardware license.

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

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.

Current FPGA replacement for MOS 6510 and 8500 processors, including the documented instruction set and cycle behavior.

The official project page links three current retail channels, and AmericanRetro exposed a direct Buy Now route on 2026-07-30. The retailer describes a same-size, no-soldering drop-in replacement; that assumes the original CPU is already socketed. A soldered CPU still requires proper desoldering and a suitable socket.

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

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.

Passive cable for powering a Commodore 64 from an external Commodore 128 power supply.

Keelog listed the 22 cm adapter at USD 23.99 or EUR 20.99 on 2026-07-30. The product is manufactured in Poland and was presented through a live order form. The seller warns that the passive adapter only conveys power and does not guarantee that an attached supply can provide sufficient current.

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

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.

Protected dual-output supplies for a C64 or later VIC-20 and a 1541-II, 1571-II, or 1581 floppy drive.

Keelog listed current regional RetroPower, Classic, and Modern configurations on 2026-07-30. The representative RetroPower US model was USD 89.99 or EUR 78.99 and included its device cable. Select the correct 120 V or 230 V version and regional plug. The current RetroPower page calls that enclosure the successor to the earlier Classic and Modern styles.

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.

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.

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.

Breaks a compatible C64 video socket out to S-Video, composite video, and RCA audio.

The product exposed a login-or-register-to-buy path on 2026-07-28. Human review says it works only with C64 units having the compatible six-pin video socket, so it is not presented as universal across C64 revisions. Check the computer's physical socket against the seller photographs before ordering. The page's AUDIO_IN header description is garbled and is not treated as usable documentation.

CPLD replacements for failed PLA chips, currently sold for Commodore 264-series computers and previously made for the C64.

The 264-series module exposed a login-or-register-to-buy path on 2026-07-27, while the separate C64 version is discontinued. Human review says the module plugs into the original socket, but the seller does not establish that every supported motherboard is socketed or document the original MOS part, board revisions, orientation, removal, or clearance. Treat it as a plug-in replacement only after confirming a compatible socket and orientation. A used C64 module needs the same checks.

Adjustable VIC-II interposer intended to reduce vertical jail bars and S-video chroma artifacts.

Retro Electronics listed one assembled LumaFix64 in stock at 16.50 GBP on 2026-07-30.

VIC-II interposer combining LumaFix video cleanup with a replacement C64 clock-generator circuit.

Protovision listed the PAL LumaTOLB at 25 EUR but temporarily unavailable with unknown delivery time on 2026-07-30. The current listing gives a three-year warranty and says the original timing chip need not be removed. Installation may require replacing the VIC-II heat shield with a larger one. A hands-on 2018 report says LumaTOLB does not work with C64 Reloaded MK2, although the separate original LumaFix does. No current NTSC order path was verified.

Small C64 cartridge that flashes one PRG file of up to 50 KB for immediate cartridge startup.

Poly.play reported low stock and a normal add-to-basket path on 2026-07-30. The package includes the cartridge, English and German manual, cardboard box, and stickers.

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

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.

Open PCB that exposes every Commodore 1530 Datassette connector line for Tapuino builds and cassette-port adapters.

The repository provides the KiCad board, schematic, footprint, and documentation files and invites builders to fabricate the open hardware. PCBWay currently offers the 26.92 by 26.03 mm V2 design as a 1.6 mm, two-layer bare PCB and labels that shared project CC BY-SA 3.0. No connector, Mini-DIN lead, enclosure, Tapuino electronics, buffering, isolation, fusing, or current limiting is included or documented. Review the manufacturing files and wiring before ordering and connect hardware only with power off.

Tested period 6510 and 8500 processors for repairing a Commodore 64 with an original CPU.

Retroleum listed several tested 6510 and 8500 variants with stock on 2026-07-30, but the store was temporarily closed until approximately the beginning of August. These are finite harvested period parts. Confirm that ordering has resumed, whether the selected chip was socket-pulled or desoldered, its pin condition, and the return terms.

Tested period 6526, 6526A, and 6526B interface chips for repairing either CIA position in a Commodore 64.

Retroleum listed tested original CIA variants with stock on 2026-07-30, but the store was temporarily closed until approximately the beginning of August. These are finite harvested period parts. Confirm that ordering has resumed, the pin and test condition of the selected part, and the return terms.

A compact inline MOSFET protector that disconnects a Commodore 64 supply when the monitored voltage exceeds the safe range.

Shareware Plus and Ami64 each listed the inline OVP64 at GBP 39 in 2026. Protovision listed six units at EUR 48 with a one-to-two-week shipping estimate on 2026-07-30. All three describe the same compact MOSFET design and a 5.40 V safety threshold. The public listings do not specify a response-time measurement, reset procedure, 9 VAC behavior, current rating, fuse, schematic, or designer. An older boxed OVP64 was sold by Shareware Plus, but its electrical relationship to the current inline product is not established.

Provides laser-cut transparent acrylic housings for original C64 motherboards and Ultimate64 replacement-board builds.

AMI64 listed every verified Plexilaser branch out of stock on 2026-07-30. The full-size C64 case was listed from GBP 100, and both compact Ultimate64 branches were listed from GBP 105. The C64 housing takes about 30 minutes to assemble and supports custom vent text. The older Ultimate64 and Ultimate64 Elite case has optional plug-in LED lighting and is physically distinct from the Elite II case. The Elite II version adds USB and SD-card cutouts, takes about 60 minutes to assemble, and has one reported MechBoard64 fit failure.

A compact semiconductor protector for the 5 VDC and 9 VAC rails of compatible Commodore power supplies.

CMD Marketplace listed four units at USD 40 on 2026-07-30. The page claims a 20 microsecond semiconductor response versus 200 milliseconds for a relay design. After a 5 V trip, its 1.25 A SMD fuse must be replaced with a soldering iron; one spare is supposed to be included. The page simultaneously displayed a USD 9 United States rate and a notice that the item does not ship to the United States, so confirm destination availability before ordering.

Replaces the failure-prone linear 5 V regulator board inside two original Commodore 64 wedge power supplies.

The Tindie page listed PowerUP! 64W PRO V2 at USD 29 on 2026-07-30, but ordering was paused while the seller takes a break through July 31, 2026. Confirm that sales have resumed and that the seller will ship to the destination. The current V2 listing says it is delivered at 5.15 V; the linked Version 1.0 manual instead documents a 5.2 V default and 5.05-5.25 V adjustment range, so follow the instructions supplied with the purchased hardware rather than assuming the older manual's calibration value.

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

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.

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

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.

Socketed rotary-switch ROM board sold with either eight C64 KERNALs or a mixed C64 and 1541 diagnostic set.

Retro Electronics listed two KERNAL-set boards and three mixed repair-set boards in stock on 2026-07-25. Both arrive preprogrammed. The pages name original and third-party ROM images but do not document their licensing; verify that you are entitled to use every selected image.

Controls stepper motors from a Commodore 64 user port for CNC and other motion-control projects.

Shareware Plus still exposes the GBP 29.95 email-order page, which said "Available from stock" when last updated on January 1, 2025. Confirm present stock, postage, documentation, motor requirements, and the external power arrangement before ordering. The page says both that the board controls two stepper motors and that it is "suitable for 4 standard motors"; human review found additional photographs but no specification that resolves the conflict or establishes safe current limits.

A historical relay protector with alternate DC and AC inputs for several Commodore power configurations.

The surviving Round 4 sale thread is explicitly titled SOLD and dates to 2017. It offered complete kits at USD 45 and assembled units at USD 85. C64 OS repeated those prices in 2022, but that does not establish later production. The former hookturn.com user-guide URL now resolves to a parked domain. Use the preserved feature and forum specifications for identification, and search the used market rather than contacting the old seller as though stock were current.

Bare replica motherboards for rebuilding damaged Commodore 64 boards in four original assembly configurations.

Bob's Bits listed the bare SixtyClone PCB at USD 35 on 2026-07-30 with live revision and optional-component controls. The Tindie page simultaneously displayed a United States shipping rate and a does-not-ship warning, so confirm destination availability before ordering. Resistor, capacitor, resistor-network, power-switch, SwinSID Nano b, and GAL-PLA options do not make the base board a complete computer.

Open ROM adapter that selects alternate C64 KERNALs through the RESTORE key and indicates the active bank with an LED.

The open project provides Gerbers, firmware, and programming guidance. Retro Electronics lists an assembled board, cables, LED, and blank 27C256 or W27C512, but its page did not expose a current stock or ordering state on 2026-07-25. Users must program legally obtained ROM images; the seller specifically notes that JiffyDOS and JaffyDOS require licenses.

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

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.

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

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.

Cassette-port microSD loader for launching C64 TCRT and PRG files through an on-screen browser.

Retro Electronics listed four assembled units with printed cases in stock on 2026-07-25. A FAT32-formatted microSD card is required and is not included.

A source-available relay board that cuts the C64's 5 V supply above about 5.6 V.

The public repository was last updated in January 2020 and PCBWay retains a bare-board order route for Revision E. No explicit hardware license is published, so this is source-available rather than licensed open hardware. Revisions C and D require a documented bridge between DIN pins 4 and 5 for supplies that place 5 V on the alternate pin; Revision E incorporates that fix. A separate builder found severe thermal drift in an older Console5-derived prototype and called that build unfit for protection. Test any completed board's trip point and stability under realistic load and temperature before relying on it.

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

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.

Brings an Ultimate64 replacement board's internal user-port header to a C64-style edge connector with the power rails needed by compatible peripherals.

The 1541 Ultimate store listed version 2.0 for EUR 9.98 but out of stock on 2026-07-30. The flat cable is included. The official documentation warns that the connector has only one correct orientation: its red wire must align with pin 1, and a shifted or reversed connection can damage the board or accessory. The header's extra pins can drive either 9 VAC generation or an APA102C LED strip; the documentation says 9 VAC is enabled when LED-strip use is off. Do not assume this earlier Ultimate64 adapter is interchangeable with Commodore's separate C64U User Port Adapter.

Experimental C64 replacement motherboard with three SID sockets, optional internal storage and sound modules, ROM switching, and extensive test points.

On 2026-07-30, UNI64 listed the bare v4 PCB at EUR 32.50 as a three-week preorder and the READY+ board at EUR 345 with a five-week order lead time. READY+ includes standard logic, the 8701, and 64 KB RAM but excludes all named Commodore-specific chips and the required 12 VDC 2 A supply with a 2.1 mm inner-diameter barrel plug. Optional Pi1541, MIDI, FM OPL2, and SSD hardware is not included. The bare page labels its feature list as Version 3 even though the product and files are v4; the linked v4 info PDF remained unreadable after the required retry under WF-071, so confirm version-specific assembly details from the supplied documentation.

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

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.