Tag: repair

Replaces the Atari 1200XL's model-specific C060609 memory-management chip with a programmed modern logic device.

The page reported two units in stock on 2026-07-27. This listing is specifically a replacement for Atari part C060609 in socket U14 of a 1200XL. Do not treat the seller's general explanation of MMUs across the Atari 8-bit family as compatibility with other models.

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.

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.

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 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.

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

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.

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.

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

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.

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.

Replaces an eMate 300 display flex cable damaged by the computer's hinge mechanism.

JCM showed four cables in stock on 2026-07-24. The seller reports testing the recreation in an eMate and says it has been used in dozens of hinge-related repairs.

Replaces the Atari FREDDIE memory-management chip with a CPLD module.

Lotharek marks FreddieCPLD discontinued. It is a full replacement for a computer already fitted with a FREDDIE chip, unlike the current Freddy Module v2 companion clock board. Installation requires safe removal of the original chip and correct orientation. The supplied bottom socket can make the module too tall in XE cases; the seller recommends removing it after testing and soldering the module into place. Confirm that the exact motherboard actually uses FREDDIE.

Replaces Apple III boot, synchronization, video, and bipolar state-machine ROMs with modern EEPROM carrier boards.

JCM's current Apple III categories listed all fourteen variants on 2026-07-24. Representative boot, sync, video, and bipolar pages showed stock, but availability can differ by part number. These adapters are position-specific replacements, not interchangeable upgrades.

Replaces the General Instrument AY-5-3600-PRO keyboard encoder in several Apple computers.

The current page offered jumper and socket selections on 2026-07-24. Original Apple II and II Plus support applies to non-Datanetics keyboards; Datanetics keyboards use the separate MM5740AAE replacement.

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.

Replaces the internal speaker in a Macintosh SE or SE/30 with a functional nickel-plated unit using a transparent cone.

The product page said Sold out on 2026-07-27. The seller does not publish impedance, power rating, dimensions, connector details, or installation instructions, so confirm those details before substituting it in an original enclosure.

Replacement bare PCB for rebuilding a Macintosh Classic whose original logic board is damaged.

The MacEffects page said Sold out on 2026-07-24. This is a bare replacement PCB, not a working logic board. No separate official Classic Reloaded BOM, placement package, donor-chip inventory, supported-revision list, or tested bring-up procedure was established. The Macintosh SE Reloaded discussion supplied during review concerns a different board.

New replacement for the analog-board to logic-board signal cable in four compact Macintosh models.

The JCM page showed 17 units in stock on 2026-07-24. Never use the cable to combine an SE or SE/30 board with a Classic or Classic II board: the identical-looking connectors carry signals on different pins, and mixing the two groups will damage the computers.

Replaces the Macintosh Portable's lead-acid battery so the computer can run from a sufficiently capable external supply.

The product page exposed an Add to cart path on 2026-07-24. A suitable higher-current 7.5 V supply is still required. This board does not remedy capacitor leakage or other faults in an unrestored Portable.

Replaces the display flex cable in a backlit M5126 or an M5120 fitted with Apple's backlight upgrade.

JCM showed eight M5126 cables and fourteen M5120 backlight-upgrade cables in stock on 2026-07-24. The two variants are not interchangeable, and neither listing claims support for an unmodified non-backlit M5120.

Replaces the National Semiconductor MM5740AAE/N encoder used by Datanetics-style Apple II keyboards.

The current page offered socket selections on 2026-07-24. This version is specifically for systems using the MM5740AAE/N and a Datanetics-style keyboard; non-Datanetics Apple II keyboards use JCM's AY-5-3600-PRO replacement instead.

Period original SID chips restore authentic 6581 or 8580 sound when matched to the computer's motherboard voltage and filter circuit.

AMI64 offered soak-tested original 6581 and 8580R5 chips from GBP 97 on 2026-07-28. These are finite period parts even when a dealer has stock. Confirm authenticity, revision, test history, socket condition, motherboard voltage, filter components, and return terms. Installing a 9 V 8580 in a 12 V 6581 board can destroy it.

A Xilinx CPLD module replacing specific failed gate-array chips in late ZX Spectrum 48K, 128K, and grey +2 computers.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and gives an unusually precise chip and host list. Neither the page nor human review supplies a removal, socket, orientation, or board-revision procedure. Treat this as skilled rework and obtain exact installation instructions before buying or disturbing the original gate array.

Replaces the display flex cable in passive-matrix PowerBook 140, 145, 160, and 165 notebooks.

The JCM page showed six cables in stock on 2026-07-24. The PowerBook-side connector can be slightly too wide; align the old and new contact patterns and carefully trim the new cable with scissors if necessary.

A revised CPLD ULA replacement for the original ZX Spectrum 128K and grey Spectrum +2.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and explicitly limits this revision to the original 128K toastrack and grey +2. It does not support the black +2A or +2B. ULA removal and replacement is skilled board work; confirm socketing, orientation, current installation instructions, and motherboard condition before starting.

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

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.

Programmed replacement ROM variants for diagnosing IBM PC, XT, and AT motherboard faults.

All three machine-family variants were listed in stock on 2026-07-25. Each replaces original motherboard ROM hardware temporarily; match the exact machine and sockets, observe chip orientation, and retain the original ROMs.

Replaces the ball mechanism in an original Apple ADB Mouse or ADB Mouse II with an adjustable optical sensor while retaining the ADB interface.

Both $72.99 variants were out of stock on 2026-07-27: the Mouse II board since May 25 and the original wedge board since July 18. Match the replacement to the exact shell and board shape before ordering. The original ADB cable is required, and installation may require moving its four wires or connector. The USB-C connector changes settings and firmware; it does not turn the mouse into a USB device.

Replacement second gear that restores automatic eject operation in compatible Macintosh floppy mechanisms.

The current storefront listed the three-gear set without an out-of-stock marker on 2026-07-24.

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

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.

Tests a VIC-20's keyboard, IEC, user, cassette, and joystick interfaces with a machine-specific cartridge and loopback harness.

AMI64 listed its GBP 47 complete cartridge-and-harness kit as available in around ten days on 2026-07-30. CMD Marketplace listed three USD 59.90 PAL/NTSC kits, but its Tindie page exposed conflicting United States shipping text and no usable US rate. Sven Petersen publishes the GPLv3 hardware and firmware project.