I am building a 6502 system off a breadboard. However, when I bought the parts, the only local store that supplied this kind of thing didn't have MOS 6502s (nor 6522s), but they did have Rockwell R6502s. I know that the
R6502 is instruction set-compatible, but is it pin-compatible with the MOS
6502 (ditto for the 6522)? This is the text printed on the chip:

R6502P
R6502-11
8324

Decoding: Rockwell 6502, plastic DIP package. I don't know the rest.

_________________
Sam

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"OK, let's see, A0 on the 6502 goes to the ROM. Now where was that reset vector?"

Sam,

Please look in the Datasheets Archive under Rockwell. The NMOS R6502 is in the datasheet titled, "R650x and R651x Microprocessors".

http://www.6502.org/documents/datasheets/rockwell/

Regards,
Mike

_________________
- Mike Naberezny (mike@naberezny.com) http://6502.org