Questions tagged [mos-6522]

Questions about the MOS 6522 VIA (Versatile Interface Adapter) chip, used in e.g. the Commodore PET and the BBC Micro home computers.

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Does the 6522 VIA swap the registers for ports A and B compared to the 6820 PIA and 6526 CIA?

According to this preliminary datasheet and what appears to be a later CSG data sheet from some data handbook, the 6522 VIA assigns to registers 0 through 4, DR (data register) B, DR A, DDR (data ...
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