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Posted By

gerliczer
on 2015-03-02
10:31:53
 Re: What does 7501/8501 opcode $FB? 6502 it has as illegal ISC/ISB

The Commodore 6502 derived CPUs work exactly the same except different number of embedded port bits are connected to pins and different clock and interrupt inputs are available. All documented and undocumented instructions work the same. The instabilities in undocumented instructions are also the same.



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