Commodore PET series

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 platform (stated family): The maker reports successful tests with PET 2000, 3000, 4000, and 8000 series computers. Cassiopei uses part of the PET stack for its fast loader. Disable JiffyDOS, and do not combine it with other cassette-port hardware 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.

Connects one CS/A65 expansion card to a Commodore 64 expansion port or beneath a PET's socketed 6502.

For this platform (stated family): The adapter installs beneath a socketed 6502. Only revision 1.1A in a CBM 8296 has test evidence, and that build needed extra power and stacked sockets. It did not physically fit a 3032; later layouts intended to improve 3032 and 8296 fit remain untested. Do not generalize compatibility to every PET.

The C64 revision 1.0C is marked okay and publishes Eagle files, but it works only with the C64, not the C128, and a fitted CS/A card can conflict with long video or IEC plugs. For PETs, revision 1.1A was tested only in a CBM 8296 and had power and clearance problems. Later 1.2A and 1.2B layouts add 3.3 V power and more mounting options but are explicitly untested. A working 8296 Ethernet stack is documented. usb65 later lists PET plus adapter plus NetUSB 1.x as tested, although the older NetUSB page says its single PET-adapter test was not fully working and suspected a supply problem. Treat that USB path as experimental. No current assembled seller was verified.

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

For this platform (stated family): The working 1.0A board was tested on a PET through its user and cassette ports. Exact model compatibility is not documented, and the tape-motor interrupt behavior needs a software workaround when using the switchable-power 1.1A design.

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.

Replaces a failed Commodore PET motherboard with a modern 32 KB board supporting selectable 40- and 80-column modes, several BASIC versions, and original PET interfaces.

For this platform (stated family): The seller explicitly lists PET 2001, 2001N, 2001B, 2008, 2016, 2032, 3008, 3016, 3032, 4008, 4016, 4032, and 8032 variants. An 8096 operates as an 8032 without its 64 KB board; 8032-SK and 8096-SK installations need a longer keyboard cable. The board excludes 8296-SK, CBM-II, and SuperPET systems. CPU-socket accessories made for an original 6502 cannot be used with its W65C02S.

Tynemouth Software's active Tindie listing offered revision 1.84B as either a through-hole self-assembly kit or a built and tested board on 2026-07-27. International buyers are instructed to contact the seller for a shipping quote.

Replaces many 24-, 28-, 32-, and 40-pin EPROMs and mask ROMs with a configurable RP2350 board programmed over USB.

For this platform (stated family): The official project explicitly lists PET computers as supported and tested, but the catalog groups several PET and CBM models here. Confirm the exact machine revision, ROM package, configuration, and socket clearance.

OneROM boards do not include ROM contents. Supply legally obtained images, choose the correct 24-, 28-, 32-, or 40-pin hardware, configure the exact ROM type and chip-select behavior, and confirm socket clearance and orientation. The open project provides a fabrication path. On 2026-07-24 JCM listed Fire 24, Fire 28, Fire 32, and Fire 40 as kit or assembled options, but its extracted page still called the 32- and 40-pin versions coming soon and did not establish which options could actually be ordered.

Replaces all eight kilobytes of hot-running 6550 system RAM in an original PET 2001-8 with one open modern board.

For this platform (stated family): The maker explicitly targets PET 2001-8 machines using 6550 system RAM. The board must align with sockets J5 and I3; inspect the original sockets and every pin before applying power, and do not force it into a different PET motherboard layout.

The assembled Tindie board has been out of stock since 2025-08-04, but source, documentation, and design files remain linked from the product page. This is specifically for 6550-based PET 2001-8 system RAM and should not be treated as a generic replacement for later PET memory organizations.

Provides source files for a Cherry-compatible Commodore PET N-type keyboard with printable supports and keycaps.

For this platform (stated family): The maker says use with an original PET is potentially possible but untested. Treat this as an engineering project, not a verified drop-in replacement. Verify the exact N-type graphics-keyboard matrix, connector, support, case clearance, and keycap plan before building.

The repository was actively updated in June 2026 and supplies PCB, firmware, support, test, and keycap files. It is an advanced source build rather than a complete retail kit. The maker built it principally for the Micro-PET and Ulti-PET family and explicitly says installation in an original PET is possible in principle but untested.

Replaces a socketed 6502 with a W65816 running at up to 10 MHz, backed by fast RAM and programmable flash ROM.

For this platform (stated family): The author demonstrated the board in a CBM 8296 and used it to run a PET 4032 test system. The project page says tests with other PETs would follow, so do not assume compatibility across every PET model. The machine must provide a suitable socketed 6502 and enough internal clearance.

The project publishes Eagle board and schematic files, VHDL and CPLD binaries, test software, and GPLv2-licensed documentation, but no current assembled seller was verified. Revision 1.2b is marked 'ok'; older revisions are prototypes. Building it depends on older Xilinx ISE-era tooling or a compatible programming path, two programmed flash devices, and a socketed host CPU. The author's 10 MHz timing uses 55 ns SRAM outside its rated access time; his burn-in test passed, but builders should not treat that result as a component guarantee.

Discontinued SD-card mass-storage device for Commodore PET computers with an IEEE-488 bus.

For this platform (stated family): petSD+ uses a PET or CBM computer's IEEE-488 bus and requires BASIC 2 or BASIC 4; BASIC 1 must be upgraded. Power off the computer and petSD+ before connecting or disconnecting them, and wait for the access LED to turn off before removing the SD card.

Manufacturing and new orders ended on 2021-02-01. The project still publishes hardware notes, a parts list, assembly instructions, firmware, and user documentation, but a complete current PCB-fabrication package was not verified. Look for a used unit or an original board or kit.

Provides a Cherry MX replacement-keyboard PCB for a graphics-keyboard Commodore PET or Tynemouth Mini PET.

For this platform (stated family): The PCB reproduces the graphics-style PET keyboard matrix and was demonstrated in a PET 4032. Installation in an original PET needs the included edge-adapter PCB, custom support or spacer fabrication, protective insulation from the case shielding, and connection of optional Shift Lock power. Do not assume compatibility with an 80-column business keyboard.

TexElec listed the bare PCB set in stock for USD 27.99 on 2026-07-30. Switches, keycaps, electronic parts, cable, support structure, insulation, and the custom mounting work required by an original PET are not included. The optional Shift Lock circuit needs a safe 5 V connection inside the PET.

Open PET repair board replacing 32 KB of system RAM and selectable ROMs while adding built-in diagnostics.

For this platform (stated family): The design targets 6502-based PETs and was developed while restoring a PET 2001-8. Confirm that the exact PET has a compatible socketed 6502, physical clearance, and an appropriate ROM image set. Its diagnostics still depend on working display logic and video decoding.

The assembled Tindie board has been out of stock since 2025-08-04, but GPL-2.0 design files remain public. The maker pages repeatedly label the $0000-$7FFF replacement as 32MB; that address range is 32 KB, and independent technical coverage also identifies 32 KB, so this catalog records the functional capacity rather than the apparent unit typo.

External SD-card storage device that plugs into the IEEE-488 port of supported Commodore PET and CBM computers.

For this platform (stated family): The seller lists 2001 systems upgraded to BASIC 2 or 4, 2001N, 3008/3016/3032, 4008/4016/4032, 8032/8096/8296/8296D, and MiniPET variants. BASIC 1, CBM-II, SuperPET, 8032-SK, and 8096-SK are unsupported. Internal drives on applicable systems should be moved to device 9.

TFW8b marked the product as restocking with an expected shipping date of April 2026, but that estimate had passed and no unambiguous current Add to Basket path was exposed on 2026-07-27. Treat it as temporarily unavailable until the seller updates the listing.

Connects a Super Nintendo controller to the user port of supported Commodore computers for software written to read its serial protocol.

For this platform (stated family): TexElec says the adapter connects to any Commodore PET user port. Some PET models need external or cassette-port power, and software must explicitly support the SNES protocol.

TexElec listed the adapter at USD 14.99 and in stock with backordering enabled on 2026-07-30. Most supported machines use the supplied power jumper. Some PET systems do not provide user-port power and need 5 V from the cassette port or an external source; high-current third-party controllers should also use external power because the user port is rated for 100 mA.

Adds an all-RAM 64 KB memory map to the SuperPET's 6809 side so it can run the preserved Super OS/9 port.

For this platform (stated family): Compatibility is limited to two- and three-board SuperPET SP9000 systems. It installs in the 6809 CPU path and is not an upgrade for ordinary 6502-only PET models.

RETRO Innovations says kits are available through its online store. This is a specialist assembly kit for a two- or three-board SuperPET, not a general PET memory expansion. Use the published construction steps and preserved software package; TPUG and the former OS/9 rights holder do not provide support.

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 platform (stated family): The maker documents PET use only for the PLA at socket UE5 with jumper 1 fitted. SuperPLA V4 cannot replace the PET's second PLA. Confirm that the exact PET board uses the documented 82S100-based UE5 circuit before installation.

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.

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

For this platform (stated family): The cassette breakout explicitly supports PET cassette ports, while the 2x12 and IEEE-488 output boards provide a separate PET IEEE-488 route. This target groups several PET models; verify the exact machine's connector, keying, orientation, and required board pair before fabrication.

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.

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

For this platform (stated family): The Tapuino Mini seller page explicitly names Commodore PET systems and lists the product in its PET category. Verify cassette-port orientation for the exact PET model, use a FAT32 SD card smaller than 32 GB for best results, and connect the device only while 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.

Replaces a Commodore PET 2001 or graphics-style PET keyboard with a compact modern tactile-switch assembly.

For this platform (stated family): The maker explicitly supports the PET 2001 and PET systems with the graphics keyboard: the layout with 20 numeric-keypad keys and no number row across the top. This usually covers 40-column PETs, not 80-column business-keyboard systems. Identify the installed keyboard matrix before ordering or connecting a used unit.

The maker now marks the 2018 article as an old reference and says the former PCB-only, kit, and assembled products are no longer available. No public fabrication package was verified. Search the used market for an original Tynemouth unit, or consider a current Petskey or source-available PET-N build.

Replaces or diagnoses PET system ROM and RAM, expands 8 KB or 16 KB machines to 32 KB, and offers selectable BASIC and display ROM sets.

For this platform (stated family): The seller lists 2001, 2001N, 3008, 3016, 3032, 4008, 4016, 4032, 8032, and 8032-SK variants, with special ROM requirements for business-keyboard machines. An 8096 reverts to 8032 operation because its 64 KB board cannot be used. CBM 8296, CBM-II, SuperPET, and non-6502 CPU-socket accessories are excluded.

The current Tindie page instructs international buyers to contact Tynemouth with their address and requested options. A separate TFW8B listing was out of stock. Confirm the five- or nine-switch version, keyboard and display ROM set, shipping, and current fulfillment before ordering. The board does not replace video RAM or character ROM.

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

For this platform (stated family): Use a PET-specific WiModem variant, not an unmodified standard unit. The store presets its jumpers and includes a two-foot lead for supplying 5 V, typically from the cassette port. Listed systems are PET 2001, 4016, 4032, 8032, and SuperPET.

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.

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 platform (stated family): The project explicitly supports Commodore PET computers through IEEE-488, using a modern PC as backing storage with XD2031. 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.