Unusual Altair 8800 power supply. Upgrade kit, factory error, or something else?

Joseph Lang joe.lang.0000 at gmail.com
Wed Nov 11 13:36:44 CST 2015

It not the rev 0 back panel for sure. I don't think it was a mistake either. If they used the same layout as rev 0 the transformer would interfere with  the card cage. 


> On Nov 11, 2015, at 2:14 PM, Tom Moss <tomjmoss at googlemail.com> wrote:
> Hi All,
> I have what appears to be an Altair 8800 with the original Rev 0 front
> panel, but the rear panel and PSU is a back-to-front version of what's
> standard on the 8800b.
> Pictures at http://imgur.com/a/2EVRS
> I'm guessing this is a factory error, since the bare patch for the bridge
> rectifier and case holes are inverted too. But I'm aware of an upgrade kit
> (8800b-PS) that was offered to 8800 owners. So I'm guessing that's where
> the PSU and panel came from.
> Can anyone shed some light on this? Are there others like it?
> Regards,
> -Tom

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