There are a few 6502 articles on the net which give the function and
timing of miscellaneous undocumented opcodes. Unfortunately, the timings
given for some opcodes, with indexing, do not seem to account for page
crossing. According to the CPU model in the hardware manual, an extra
cycle is almost certainly required in certain cases and some these do
not agree with the numbers in the articles. Has anyone verified the
cycle count for undocumented opcodes?
Thanks.
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