Ray Bryan wrote: > > What about the 6532 that I have seen in the Commodore printers? how do the > the pin-outs compare to 6522 or 6526 or even the 8520 (Amiga CIA) or 8521 > (C128)? - do these match the 6821? I don't know *how* different the pinouts are, but they are different. The 6532 is a RIOT (RAM, I/O and timer), similar, but not pin compatible to the 6530 RIOT that contains less RAM, but also a ROM. The 6821 is a simple dual port I/O chip which is pin and register compatible to the 6520. I think there's also the 6820 and the 6521, but I have not idea about their capabilities. The 6522 is a much more versatile chip (hence the name VIA) with timers and shift registers added, and it is not compatible to any other chip. It's a very popular chip and was used in many machines and peripherals. The 6526, 8520 and 8521 are all CIAs with only a few differences. All are pin compatible, but the 8520 has a few register differences, and the 8521 seems to be a failed 6526 replacement with some compatiblity problems. I don't know what these problems were, but there must be a reason why only one was used per C64 or C128, and it was later replaced by the new 6526, that has a problem that even makes some programs crash ... There's also the 6523 and 6525 triport interface adaptors: pin and register compatible, but the 6525 has more registers and functions. Nicolas Message was sent through the cbm-hackers mailing list
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