On 15/11/2017 14:06, Gerrit Heitsch wrote: > >> Conventiently that covers the c64/plus4/c128, so as long as the >> undocumented opcodes are stable across all three then they are safe >> to use no matter what process the chip was made with. > > Did someone ever test that? > I don't know how well it's been tested, but between C64 (nmos) & C128 (hmos-ii) and the plus 4 (hmos-i & hmos-ii). I would have thought there are a reasonable number that are in use, some of the opcodes aren't very useful. Besides, the 65c02 isn't only incompatible because of undocumented opcodes. There were a few other changes too. Message was sent through the cbm-hackers mailing listReceived on 2017-11-15 16:00:02
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