On 2014-11-27 00:54, groepaz@gmx.net wrote: > On Thursday 27 November 2014, 00:46:29 silverdr@wfmh.org.pl wrote: >> Should I expect any troubles after replacing MOS6502s with R6502APs? >> Undocumented opcodes' incompatibilities? Other gotchas? > > rockwell and synertek licensed the 6502 from MOS, so these should be identical > to theirs... That would mean that they licenced down to the mask level. Was this the case? Or just rights to make own design based on the MOS one. If that's the same design then it should be compatible even with all undocumented opcodes. > anything else probably not :) no idea how close other clones > are... The R6502AP is AFAIR a 2MHz Rockwell version. I got those in place of 1MHz MOS6502s, which I wanted. Wondering now whether I should return them. If they are indeed fully compatible / the same as MOS then fine. Otherwise I can envision some unpredictable things with e.g. the illegal opcodes. -- SD! Message was sent through the cbm-hackers mailing listReceived on 2014-11-27 01:00:02
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