Posted By
TLC
on 2006-07-21
17:34:28
|  Re: UNdocumented instructions....
Hi Mike!, you might want to take a look at these articles:
http://www.oxyron.de/html/opcodes02.html
http://www.filegate.net/cbm/6-tech/pal_time.txt
In short, the situation is the same (AFAIK) on all models of the Plus/4, in the respect that those opcodes found to be stable are also stable on the 7501/8501, and the rest are similarly unstable like on the '64 or '128. I'm not aware of differences between the 7501/8501 or different revisions of the 8501... if two unstable opcodes behave differently on two Plus/4s, it's rather due to manufacturing tolerances, similarly to the '64 or the '128.
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