The board came from the owner of former CBM engineer David Didorio's house, who passed away recently. I don't believe I ever met him. He lives nearby where I live. There wasn't anything else odd like that one board. Bill On Mon, Mar 8, 2021 at 1:13 PM Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> wrote: > On 3/8/21 6:39 PM, Jim Brain wrote: > > 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. > > The numbering suggests that it's older than the 250466 design. Same goes > for the datecodes on the chips on it. But it shows a lot of details that > later appeared on the 250469 boards. > > It would be interesting to know which VIC goes onto that board, is Pin > 13 of the VIC socket connected to +5V or something else? Where does the > 6581 SID gets the +12V from? > > My guess is this board was supposed to replace the 250425, but they ran > into some kind of problem(s) and had to make the 250466 as a stopgap > until the 250469 was ready. > > Gerrit > > > > > >Received on 2021-03-08 20:02:56
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