user guide for the VIC20 Diagnostics cartridge to try to explain what all of these tests indicate
The kit will be available in two versions, the same loopback plugs with a choice of cartridges.
Dedicated diagnostics cartridge kitThis version comes with a dedicated diagnostics cartridge, with the VIC20 diagnostics ROM and the RAM it requires to run.
ROM/RAM Cartridge with diagnostics loopback kitThe other version comes with the DIP switch controlled ROM/RAM cartridge, an early version of my VIC20 Penultimate cartridge (N.B. not the later menu driven version as that is not suitable for diagnostics). Using the DIP switches, a series of ROM cartridges can be selected, includes the diagnostics ROM. This has selectable RAM options from 3K to 35K and one of 32 4K or 8K ROM images.
VIC20 Penultimate cartridge for the full list. The DIP switch version is used here as the menu driven version does not include the diagnostics ROM (you can't navigate the menu if your VIC20 is not working or if you have the keyboard loopback installed).