The test harness should only be used with 586220, 588121and 785260 diagnostic software. This is Compatible with588121, 586220++/ ,and 7 85260 diagnostic software. Commodore C64, C64C, C128 -Diagnostic Test Harness.
Commodore 64 c128 Diagnostic Test Harness & Cartridge 586220++ Dead Test c64
DIY Kit Commodore 64/128 Diagnostic Test Harness for 586220 & 785260 Cartridges
Commodore VIC 20 Diagnostic Test Harness VIC-20 VC-20
Commodore 64/128 Multirom Diagnostic Test Cartridge 586220 DesTestMAX GOLD ENIG
COMMODORE 1660 MODEM 300 BAUD FOR COMMODORE 64 C128 SX-64 VIC-20 SEALED NOS L2
Commodore 64/C128 (1 X) Serial Data Cable for C64/C128 ca.2m Long, Work ´ S