On Thursday 27 November 2014, 01:08:43 silverdr@wfmh.org.pl wrote: > 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. as far as i know they licensed the mask (not only for the 6502, but also for other chips) > > > 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. you could try running the available test programs on it :) (eg put it into a 1541 and run the testsuite by ninja (csdb) which is a port of the lorenz suite, and checks pretty much all important things except a few odd corner cases of the so called "unstable" opcodes - which are not terribly important for real world programs anyway) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ar.pokefinder.org Dick size still matters, just that money, race and in some extreme cases personality has a greater impact than an inch or two. Message was sent through the cbm-hackers mailing listReceived on 2014-11-27 01:00:39
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