[vcf-midatlantic] VIC20 Test Cartridge

Richard Cini rich.cini at gmail.com
Thu Dec 24 18:44:42 EST 2020

First off, Happy Holidays to everyone on the list!


I’m working on a VIC20 project and I know there is a Commodore-issued VIC20 diagnostics cartridge (I found the ROMs and instructions), but I haven’t found a schematic for the board, or blanks. I know Tynemouth Software in the UK used to make/sell them, but they no longer seem to have them. Does anyone have a schematic? I figure it’s probably similar to a RAM/ROM cartridge, but I didn’t know the addresses for the RAM. ROM I assume is the usual 8K blocks.







Rich Cini




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