> Hmmm...I thought all Macs (from that era) had auto-switching PSUs.

The earliest ones didn't, unfortunately. Apple intended for the first generation models to have a switch- (or jumper-) selectable option. The Plus, for example, allegedly has a jumper option inside to select 110/220. However, I have never seen one. That doesn't mean that they don't exist, of course, but I have seen 2 different analog boards to support the two voltages, so that makes me think that the jumper idea never quite got implemented. The situation is almost certainly the same with the 128 and 512, so Stuart was right to use an external transformer!

I'd love to hear from others on this list to see if they have actually ever seen any truly jumper-selectable classic analog boards.

--Tom


--
Prof. Thomas H. Lee
Center for Integrated Systems, CIS-205
420 Via Palou Mall
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu
650-725-3709 voice, -3383 fax


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