Commodore 64 / 128 Multirom Diagnostic Test cartridge 586220 and others based on Versa64Cart Harness is needed to perform a full test in some diagnostics (some of the tests will give BAD without harness), have a look to my other items for sale. High quality GOLD ENIG PCB and Gold Finger with Beveling for easy insertion and durability. Included also the DEAD TEST that other multi-ROM cartridges does not have. Very useful if your C64 wont boot, no need for more cartridges to diagnose your C64. Depending on avaibility the cartridge could be equipped with W27C512 EEPROM or ceramic 27C512 EPROM, placed in socket so you can change the programs on it if you have an EPROM Programmer. I have also this cartridge with case, have a look to my other items for sale If you want to buy more it.