I had no idea the 8562 was already in development back in 1984. On Wed, Aug 26, 2026 at 6:28 AM Alexander Jacocks <jjacocks_at_gmail.com> wrote: > > On Wed, Aug 26, 2026 at 1:34 AM Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> > wrote: > >> On 8/26/26 06:42, Alexander Jacocks wrote: >> > Folks, >> > >> > I've had this C64 for a few years, and it would need some attention to >> > be functional, but it was immediately obvious to me that it wasn't a >> > normal machine because it has a flat-flex keyboard cable. Then, when I >> > looked closer, most of the chips are normal, but: >> > >> > 1) The ROM is an EPROM, and appears to be a combo basic/kernal >> > 2) The IC in U6 is purple ceramic, and clearly has a hand-stamped >> label, >> > "240431", which doesn't match anything that I am aware of. Based on >> > location, it's a 6510 of some variety, but maybe a test production run >> > of the 8500? >> > 3) There are extra wires on the keyboard itself (which is a Mitsumi >> > membrane) >> > 4) The board has a SuperPLA, 251715-1 >> > 5) The RAM is 2 64k x 4 HM50464-15 chips like the 250266 and 250469 >> > >> > I'm sure that there are other oddities. I've shared a quick album of >> > photos here: >> > https://www.icloud.com/sharedalbum/#B1f5BydzFLHLGD <https:// >> > www.icloud.com/sharedalbum/#B1f5BydzFLHLGD> >> > >> > I've not attempted to power up the machine and would need to at least >> > dump the ROM first. >> > >> > Any thoughts/comments are welcome. >> >> That looks like an early version of what would become the 250469 board. >> Some ICs are in a different position or orientation, but the general >> layout is there, including the 251715-01 PLA. The contents of the EPROM >> should be identical to the 251913-01 ROM which is pincompatible with a >> 27128 EPROM. That IC with the 240431 number is probably the 8500 CPU. >> The 8500 also appeared on some 250425 boards. >> >> Also, a photo of the full board would be nice. The only one that comes >> close is fuzzy. >> >> Gerrit >> > > Thanks, Gerritt. If you click on the fuzzy image of the whole board, you > should be able to see the full resolution version. Same for the other > photos. > > Hopefully this link will go directly to the full-size image: > > https://www.icloud.com/sharedalbum/#B1f5BydzFLHLGD;D5AA8DA6-B68C-4B33-BE11-9AAD6C64CFC8 > > - Alex > >> >> >> -- - Peter RittwageReceived on 2026-08-26 13:00:01
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