Tag: diagnostics

Moves an Apple II peripheral card outside the case for repair, development, and testing.

The extender was out of stock on 2026-07-24. The vendor warns that longer ribbon cables may cause unreliable operation; use it only with power off while connecting or removing cards.

Improved firmware for the Apple IIc and IIc Plus, offered as a current ROM programming service.

Infinity Products listed its ROM 4X and ROM 5X flashing service without an out-of-stock marker on 2026-07-24. The open firmware project had a current March 2026 release.

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

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.

Visualizes Macintosh PDS signals with LEDs and provides a pass-through plus a right-angle test connector.

The Juicy Crumb page showed BlinkenPDS in stock on 2026-07-24. It is a bench development tool and is not intended for permanent in-case use; the maker says it fits poorly inside a computer. The second connector does not establish that arbitrary pairs of PDS cards are electrically compatible.

Switches an Apple II F8 ROM socket between its normal Auto-Start Monitor and a licensed RAM diagnostic ROM.

The current Infinity Products page listed an assembled product without an out-of-stock marker on 2026-07-24. Personal-use fabrication files remain available under a noncommercial license; the Dead Test ROM has separate licensing terms.

An external fifteen-ROM selector for original Sinclair 48K, 128K, and grey +2 computers, controlled by one button and binary indicator LEDs.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and explicitly limits support to original Sinclair 48K, 128K, and grey +2 machines. Power off before connecting or removing it. Confirm the exact ROM contents and any software licensing from the current unit rather than assuming every example named on the board is supplied or redistributable.

Emulates Apple ProFile and Widget hard drives from SD-card images and provides low-level diagnostic and recovery tools.

The Juicy Crumb page provided an order path on 2026-07-24 and explicitly marked the internal option in stock. An ESP32 module is optional in the store selector but required for operation, so verify the contents of the selected external or internal package. The internal variant requires a host with a Widget Data Connector and uses a Widget or Twiggy power cable.

Preprogrammed selectable replacement for several 2 KB system and character ROMs used in early Apple II computers.

The MacEffects page said Sold out on 2026-07-24. Match the module's 9316 or 2716 mode to the socket. It does not replace the 2513 character ROM on pre-Revision-7 motherboards.

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.

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

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.

Combines configurable VIC-20 RAM, a large built-in software library, diagnostics, fast loading, and optional SD2IEC storage.

TFW8B listed the PenUltimate+3dcr as shipping on 2026-07-29. The older PenUltimate+, +2, and microSD-based +3 are end-of-life variants. Product-page option text mixes retired and current generations, so confirm that an order is for the +3dcr and whether any optional media are included.

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.

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

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.

Schematic-only ISA Port 80h diagnostic display for troubleshooting PC hardware.

This is a reference design, not a fabrication-ready kit. The page provides PDF and EAGLE schematics but no PCB layout, Gerbers, or bill of materials, so a builder must complete the hardware design.

Displays the current head position of a compatible 5.25-inch Apple II floppy drive.

The assembled monitor was out of stock on 2026-07-24. It requires a compatible 5.25-inch Apple II floppy drive and the included 20-pin cable.

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.

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.

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.