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/ ). SegherReceived on 2018-06-10 22:01:40
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