Am 08.03.21 um 19:42 schrieb Bill Degnan: > > > On Mon, Mar 8, 2021 at 1:37 PM Mario Kienspergher <contact_at_kinzi.net > <mailto:contact_at_kinzi.net>> wrote: > > > Am 08.03.21 um 18:39 schrieb Jim Brain: >> On 3/8/2021 11:29 AM, Bill Degnan wrote: >>> Hi, >>> I have a strange C64C (I believe) motherboard with: >>> >>> PCB ASSY NO.250451 >>> PCB No. 251915 Rev.2 >>> >>> ...printed on it. I don't see this board documented in the >>> normal places and the PCB does not come up in a search, any >>> ideas? The VIC-II is missing. >>> >>> https://www.vintagecomputer.net/commodore/64C_250451/250451_251915_pic1.jpg >>> <https://www.vintagecomputer.net/commodore/64C_250451/250451_251915_pic1.jpg> >>> >>> Thanks >>> >>> Bill Degnan >>> >> That's an odd one. Like a CR board, but with 8 DRAMs, though not >> ina 2x4 config like on the 466 board. >> > Indeed, looks like they were testing it but trashing it because of > problems, as the 250466 came much later with a NMOS VIC and old > glue logic. > > IC-stampings are from mid/late '84. Maybe the HMOS-II-Version of > the VIC did not perform very well or the yield was too poor, or > known problems with other HMOS ICs (7501, 7360) forced postponing. > > Anyway, a sensational finding. Where did you get it from, Bill? > > -kinzi > > > It came from the estate of David Diorio, CBM engineer. It was donated > to kennett classic, the nearby computer museum. There are a few CBM > prototype-y things there. kennettclassic.com <http://kennettclassic.com> > > Bill OK, thank you, so it's very likely genuine and no counterfeit. Interesting how many unknown things still come to light even nowadays ... :-) -kinziReceived on 2021-03-08 21:00:19
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