Acorn Bitstik drawing system (this needs a 6502 2nd processor and dual 80 track disk drives)
Vine micros: Replay system (saving/restoring game state to disc)
Solidisk: Sideway RAM (the original sideway ram & 2MEG 128K board)
Solidisk: 4MHz accelerator boards (4Meg 32K, 4Meg 256K)
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