Am Mittwoch, 15. November 2017, 12:48:05 CET schrieb Gerrit Heitsch: > On 11/15/2017 12:44 PM, silverdr@wfmh.org.pl wrote: > >> On 2017-11-15, at 12:23, didier derny <didier@aida.org> wrote: > >> > >> not sure the 6502 from wdc sold by mouser are a direct remplacement of > >> the 6502 used on our commodore... > >> > >> I have a 6502 from wdc it never worked on any machine, apparently it > >> needs an adapter for some signals...> > > AFAIR there are some pin differences with some extra signals and also GND. > > > >> you got these fake 6502 from many sellers ? or from the same.... > > > > I bought it once from one seller. A larger batch. Tested a few randomly, > > using the test prg for the floppy, gpz (AFAIR) pointed me to and it > > showed only the slight difference on one (I think) illegal opcode, which > > was supposedly to be all fine. The discussion should still be in the > > archives. So the ugly bottoms of the chips aside things looked pretty > > much OK. Until I started to get some difficult to explain errors with > > some of my DD boards. It was not that they were some other chips > > relabelled. They were definitely working, but not reliably. > Illegal Opcodes were never guaranteed. If you want those to work, you > have to stick to 6502 from MOS, everyone else might have made small > changes to the mask or the process which caused some illegal opcodes to > behave differently. not entirely true - some second sources, eg rockwell, licensed the masks and the chips are identical to the MOS chips. -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ar.pokefinder.org Viele Leute verstehen nicht, was Chancengleichheit heißt. Jedem ein Los geben, von denen alle Nieten sind, das ist Chancengleichheit. Message was sent through the cbm-hackers mailing listReceived on 2017-11-15 15:02:37
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