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? -kinziReceived on 2021-03-08 20:02:38
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