Tag: test harness

3 matching upgrades

Showing 3 products.

StatusProductWhat it doesCompatibilityLinks
AvailableChecked Jul 30, 2026C64/C128 586220 Diagnostic Harness Familyby Sven Petersen and Commodore service design; assembled by several sellers
c64c64cc128sx 64586220785260diagnostic cartridgetest harnessloopback testram testrom testport testsid testciaopen hardwarerepair

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.

Sources
  • Commodore 64 Exact model
  • Commodore 128 Exact model
  • Commodore SX-64 Exact model
586220 harness open projectHarness design and operating notesBuy the Retro Rewind harnessBuy the Retro Rewind C128 keyboard dongleBuy the Retro-Updates harnessBuy the AMI64 complete kitBuy the Retro Electronics complete kit
Build itChecked Jul 30, 2026Diag264 Diagnostic ROM and Harnessby Rob Clarke, with OpenC16Cart hardware by SukkoPera
c16plus 4teddiagnostic cartridgediagnostic romtest harnessloopback testram testrom testkeyboard testcassette portiecuser portaciapalntscdiyrepair

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.

Sources
  • Commodore 16 Exact model
  • Commodore 116 Exact model
  • Commodore Plus/4 Exact model
  • Commodore V364 Exact model
Diag264 project and manualDownload Diag264 0.97Build the OpenC16Cart cartridge
AvailableChecked Jul 30, 2026VIC-20 Diagnostic Cartridge and Harness Familyby Sven Petersen, based on Commodore service software; assembled by several sellers
vic 20diagnostic cartridgetest harnessloopback testkeyboard testiecuser portcassette portjoystick portburn in testopen hardwarerepair

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.

Sources
  • Commodore VIC-20 Exact model
VIC-20 Diagnostics open projectDesign and operating notesBuy the AMI64 complete kitBuy the CMD Marketplace complete kit