RE: C64 TOWER _________________________________________________________________ From Matthew Hudson Date Fri, 06 Mar 1998 21:50:41 -0600 Lorax wrote: > > Does anyone know a power supply maker that makes 5V/9V/12V power supplies > > that fit in tower cases? If not, is it possible to pull one of the 5V up o r > > a 12V down with some simple circuit? I know nothing of power supplies... > > First of all you need to check if that 9V is DC or AC. On the 64 > the 9V from the power supply was AC current and I expect it will be on the > 128 too but I've never put the tester to mine. If it is then you will > never get it from a PC power supply because these deal stictly in DC > current. The only way you would be able to do that would be to actually > go inside the PC power supply and tap voltage from in between the > transformer and the rectifier. Depending on the transformer you might be > able to tap any desired voltage off of it and that could be all you need > for the 9V AC. The 9VAC in the C64 goes to a 5V regulator and a 12V regulator. Hmm. Thinking about it now you could remove both the regulators and drop the +5 and +12 lines directly to the MB. You'll loose the +9 UNREG at the user port and the cassette port but it should work (although you could put in a 9.? zener there and get the desired voltage). -Matt