Commodore 16 upgrades

Replaces the CPU in Commodore 264-series computers and can add 512 KB of Hannes-compatible expanded memory.

For this system (exact model): The seller explicitly names and illustrates the Commodore 16. Match the CAS connection to the board's one-bit or four-bit DRAM layout and preserve module orientation.

Lotharek marks the module discontinued. CPU-only use requires correct pin-1 orientation and a compatible socket or safe desoldering. Enabling the 512 KB expansion is invasive: remove the original DRAM and connect CAS to pin 15 on an eight-chip, 1-bit layout or pin 16 on a two-chip, 4-bit layout. Confirm the exact motherboard, CPU package, memory layout, and software's Hannes banking support before buying or installing a used module.

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): The seller explicitly lists the C16 for both the five-pin composite family and the eight-pin S-Video and composite cable. Confirm the exact computer connector and display input before selecting a branch.

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 C16. This is a composite-video cable for a display with a compatible SCART input.

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.

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): Use the Commodore 16/Plus/4 adapter. The current product page lists BBT, BIN, CRT, D64, D71, D81, D8B, P00, PRG, and T64 support for this platform.

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.

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 C16 testing. Some programs that overwrite the cassette buffer may need the standard slow PRG loader. Disable JiffyDOS and avoid other cassette-port hardware.

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.

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 C16. Supply the required IEC cable and compatible external power supply.

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.

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

For this system (exact model): Retroleum explicitly says its original round breadbin-style C64 LED assembly was also used in the C16. Confirm the LED mount, cable length, connector, motherboard revision, and polarity before installation.

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.

DIY diagnostic ROM and loopback harness for PAL and NTSC Commodore 264-family computers.

For this system (exact model): The maker tested the C16 in PAL and NTSC configurations. The cartridge build detects the video standard from the installed KERNAL, while a replacement-KERNAL build needs the appropriate PAL or NTSC image. Serial and cassette loopbacks are the minimum automated I/O set. Keyboard and joystick tests can be performed manually. Connect or rearrange the cartridge, ROM, and loopbacks only with power off.

Rob Clarke's current download directory offered Diag264 0.97 on 2026-07-30. The maker also offers a programmed EPROM at media and postage cost by email. The software is CC BY-NC-ND 4.0: unmodified personal distribution with attribution is allowed, but modification and commercial resale are prohibited. The maker warns that some third-party marketplace copies were unauthorized or modified. Loopback hardware may be resold when the attribution conditions are met.

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

For this system (exact model): The official site identifies the C16 as a supported computer family. Obtain a licensed, machine-specific offering and verify the exact ROM package and installation method.

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.

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

For this system (exact model): The seller explicitly names the Commodore 16. Confirm the original PLA is socketed or arrange safe desoldering, and obtain the missing orientation instructions before installation.

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.

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

For this system (exact model): The README gives an exact seven-pin Mini-DIN wiring table for using a Commodore 1530 Datassette with the Commodore 16's 1531-style port. Builders must supply the connector and cable and reproduce the documented ground, VCC, motor, read, write, sense, and unused-pin mapping.

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.

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 maker description says a custom multi-output system can be built for the C16. This is a made-to-order option rather than evidence that every illustrated model supports the C16. Confirm the exact output, connector, and simultaneous-load configuration.

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.

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 C16 for the composite family. Confirm the machine connector and selected lead before ordering.

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.

No-solder SRAM daughterboard that expands a Commodore 16 or 116 to 64 KB and can switch back to 16 KB.

For this system (exact model): The board uses special thin pins for the C16's original TED socket and requires no motherboard modification or soldering. Remove and reinstall the TED with correct orientation, select 16 KB or 64 KB, and reset after changing the setting.

Poly.play listed the board as out of stock on 2026-07-30. The earlier direct AmiBay sales thread is closed. Use PCB revision 1.4 or later: the maker reported an error in revision 1.2, refunded those boards, and said revision 1.4 was corrected and tested with Diag264. A reset is required after changing the 16 KB / 64 KB selection.

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 C16. Confirm the physical serial connection and power method for the chosen board rather than assuming a C64 cassette-port package will fit.

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.

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): Sidekick264 requires the published passive adapter, a Raspberry Pi 3A+ or 3B+, the d=3 delay setting, some overclocking, and an external power supply. Never power Sidekick64 from a C16.

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.

Configurable replacement for failed 82S100-based Commodore PLA chips, with documented modes for selected C64, 264-series, PET, CBM-II, and 1551 hardware.

For this system (exact model): Remove all configuration jumpers and install the module at U16 only after confirming that the original 82S100-based PLA position and socket match the official instructions.

Individual Computers' main product index, last modified in May 2026, lists SuperPLA V4 as a spare part while placing the older SuperPLA and V3 under Sold out. The current shop root also exposes a Super PLA V4 product image, but Tavily did not expose an exact product-specific cart or stock control on 2026-07-30. Confirm current orderability before buying. The underside jumpers and adapter pins are very small; use the official mode diagram, tweezers, bright light, and careful handling.

Arduino-based SD-card datasette emulator family for Commodore cassette ports, with TAP writing on the Mini variant.

For this system (exact model): Both seller variants explicitly support the Commodore 16 but require a separate C16/Plus/4 cassette-port adapter. Supply a suitable SD card and connect or remove all hardware only while the computer is powered off.

Retro Electronics listed one full-size Tapuino and two Tapuino Mini units in stock on 2026-07-27. An SD card is not included, and the required C16/Plus/4 cassette-port adapter is excluded.

Adds SD mass storage to Commodore 264-series computers and can replace the paddle cartridge in a real 1551 drive.

For this system (exact model): The project explicitly supports the C16 through its expansion-port TCBM interface. Disk images are exposed read-only, while ordinary files support DLOAD and DSAVE.

The repository provides Gerbers, firmware, hardware instructions, and release files sufficient for a DIY build. The maker invites requests for a completed unit but does not advertise standing stock. Disk images are read-only, and the device does not reproduce a 1551 exactly. When a TCBM cable is fitted, both specified ground pins must be connected as documented.

Replaces the C16's original DRAM and multiplexers with a socketed SRAM module that can select 16 KB or 64 KB operation.

For this system (exact model): The module was designed and tested for a stock Commodore 16. The installation removes both 4416 DRAMs and both 74LS257 multiplexers. Preserve the original chips, confirm every socket and signal connection, and test the original 16 KB configuration before fitting the SRAM module.

The maker's 2024 article still links a SellMyRetro offer and says kits are available, but current stock was not independently established on 2026-07-29. This is explicitly an expert installation: four ICs must be removed without damage, four sockets fitted, and A14, A15, and phi-0 signals connected. The maker warns that it is not a beginner project.

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

For this system (exact model): Eduardo Casino's open TED-series layout explicitly supports the C16. It needs a 1 mm PCB, an ESP32 Mini Kit, two mini-DIN plugs, and the published parts; its joystick numbers are swapped relative to the C64 firmware.

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.