Miika Seppänen's message bounced: [quoted messages about CMOS vs. NMOS removed] Several years ago I bought one for my VIC-20 to replace its broken 6522. It works (or should I say "worked", since the VIC is dead now. Maybe the CPU this time :( ) fine, so does it really matter if the chips are NMOS or CMOS? -Miika Yes, it does matter when it comes to less basic features. The instruction set of the CMOS 6502 processors differ from the NMOS 6502 ones, and also the behaviour of documented instructions differs. I don't know what differences there are in the logical behaviour of the NMOS 6522 and the CMOS 6522, but I'd be surprised if there weren't any. There may also be electrical differences. Marko Message was sent through the cbm-hackers mailing list
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