On 3/8/21 11:43 PM, Peter Rittwage wrote: > 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 >> >> Thanks >> >> Bill Degnan > > Wow, you found a prototype board! > > This is obviously (by the part number) after the 250425, but curiously > BEFORE 250466. Maybe this board was not stable or the new PLA could not be > manufactured quickly or cheaply enough (it was not a Commodore chip- I > thought it was a Sanyo) so they stuck with the old design for one more > iteration? The PLA also came from other makers. I have seen YAMAHA and SHARP as well. Might have been the VIC that wasn't ready since that board needs the HMOS-II VIC. GerritReceived on 2021-03-09 08:00:02
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