Zane H. Healy wrote: Right next to your C-128D? Doc

Huh? The 128D(CR) has an integrated power supply. Perhaps you mean a flat 128? -- ------------------------------------ personal: http://www.cameronkaiser.com/ -- Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser at floodgap.com -- When in doubt, take a pawn. -- Mission: Impossible ("Crack-Up") ------------

Doug Jackson wrote: Keep me in mind. I'm a bit busy at the moment, but I think I have C128 PSU or two around here with no C128 to use them on, and I can ship. But, you'll have to be patient. I just grabbed a big stash from Minneapolis, St. Paul last weekend (100-150 cu ft of CBM stuff), and I'm in the thick of it. Jim -- Jim Brain, Brain Innovations (X) brain at jbrain.com Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com

On Wed, 17 Jun 2009, Tony Duell wrote: I know we went through all of this several months ago ("Do the Commodores really need the 9VAC?"), but my 128D has an AT power supply in it, therefore is not feeding the system with 9VAC, and is functioning perfectly well. I've even pulled the PSU out of a 1571 and use an external Molex from the AT PSU in 128D to power the 1571. In my mind I say it is more efficient. No empirical proof of this, however. :) - JP

Isn't the AC used by the SID chip? g. -- Proud owner of F-15C 80-0007 http://www.f15sim.com - The only one of its kind. ScarletDME - The red hot Data Management Environment A Multi-Value database for the masses, not the classes. http://www.scarletdme.org - Get it _today_!

On Thu, Jun 18, 2009 at 2:05 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote: My answer would be it depends on what you want your Commodore to do. The cassette is one thing that runs off of the 9VAC. The internal 12V DC is another (and that's what the SID needs). So if you provide +5V and +12V DC to the machine, you can have sound without 9VAC. The TOD ticker is tapped off the 9VAC, but that's not essential to normal operations, and in fact, I think you'd have a hard time finding anything that used the TOD on the CIAs anyway. The final thing I can think of off the top of my head that might need the 9VAC is the Commodore RS232 cart - I _think_ it derives the negative voltage for the RS-232 drivers by tapping AC from the user port. You can make a functional replacement with a MAX232 chip and 4 caps, so it's hardly a show stopper, but if you had one lying around and wanted to use it, I think you need 9VAC for it to work (but it's been years since I opened one up, so I could be misremembering this one). So if you don't need the CIAs' TOD, and you don't need to use a cassette drive, and if you don't need to use the authentic C= RS-232 card, you should be able to feed +5V and +12V at sufficient current to a C-64 or C-128 and it should work just fine. I think lacking +12V will kill video as well as sound, so I don't think the +12V is optional. -ethan

On Fri, Jun 19, 2009 at 12:20 AM, Cameron Kaiser <spectre at floodgap.com> wrote: Ah, well there you go then. That's too new for my experience. I had no idea it used them. So... add to the list... no 9VAC == no TOD ticker == GEOS issues. Do you know if GEOS would not work, or would you get stagnant timestamps on your files, or what? -ethan

Sure, take a look at this: http://pinouts.ru/Power/c128power_pinout.shtml - C128 pinout http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_Power_supplies/body_ami… Amiga pinout, with photos Just build a proper psu and use an amiga cable :o)