Am Dienstag, 12. Juni 2018, 18:54:18 CEST schrieb Gerrit Heitsch: > On 06/12/2018 05:44 PM, groepaz@gmx.net wrote: > > Am Dienstag, 12. Juni 2018, 17:05:20 CEST schrieb Mia Magnusson: > >> Den Sun, 10 Jun 2018 15:50:50 -0500 skrev Segher Boessenkool > >> > >> <segher@kernel.crashing.org>: > >>> On Sun, Jun 10, 2018 at 10:17:17PM +0200, Gerrit Heitsch wrote: > >>>> On 06/10/2018 09:46 PM, Segher Boessenkool wrote: > >>>>> On Sun, Jun 10, 2018 at 06:42:02PM +0200, Gerrit Heitsch wrote: > >>>>>> On 06/10/2018 05:36 PM, Segher Boessenkool wrote: > >>>>>>> http://siliconpr0n.org/map/mos/6526/mz_mit20x/ > >>>>>>> > >>>>>>> The ports are the low half of the pins (PA on the left, PB on > >>>>>>> the right). > >>>>>>> > >>>>>>> (I have a .xcf if anyone is interested, marked quite a few > >>>>>>> signals, but I haven't done the port stuff very much. It's > >>>>>>> about 400MB). > >>>>>> > >>>>>> That looks quite different from the one I posted. Looks like MOS > >>>>>> did quite a bit of redesign between the NMOS 6526 and the HMOS > >>>>>> 8521 (which still got labeled 6526). Might explain the little > >>>>>> differences in the way they behave. > >>>>> > >>>>> No, this is an actual 6526r4. This is an 8521r1: > >>>>> > >>>>> http://oms.wmhost.com/misc/MOS_6526A_CIA.jpg > >>>>> > >>>>> (and this is an 8520r4, the CIA used in amigas; it has a different > >>>>> TOD clock, and as you can see it's different from 8521 in other > >>>>> ways, too. But clearly 8520 and 8521 are more related. The > >>>>> lineage is almost certainly 6526 -> 8520 -> 8521: > >>>>> > >>>>> http://siliconpr0n.org/map/mos/8520/mz_mit20x/ ). > >>>> > >>>> Yes, but the 8521 is a drop in replacement for the 6526 (I have a > >>>> C64 Board with a 8521R0 on U2) and later revisions of that chip > >>>> have been labeled as '6526' again, probably to avoid confusing the > >>>> customers. You can tell them apart by the datecode or by the '206A' > >>>> or '216A' next to the datecode. > >>> > >>> _Almost_ drop-in replacement, yes. But the die photos are really easy > >>> to tell apart (an 8521 does not say "6526" on the die, it says > >>> "8521"). > >> > >> I can't remember which versions, but at least some version of the CIAs > >> can only be used as one of the two CIA's in a C64. Using it as the > >> other CIA causes keyboard problems. > > > > no, both can be (and are commonly) used in either position > > > >> And when using it as the CIA that > >> generally works causes interrupt failure in the common diagnostic cart > >> (the one that's not called dead test, not sure if it has a better name > >> than diagnostic). > > > > that is correct - some of those diagnostic tests fail with the "new" CIA > > Only if they don't take the 'new' behaviour into account. of course - and they obviously dont :) -- http://hitmen.eu http://ar.pokefinder.org http://vice-emu.sourceforge.net http://magicdisk.untergrund.net It doesn't matter who votes. What matters is who counts the votes. <Josef Stalin>Received on 2018-06-12 20:00:06
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