Correction...
The Altair 8800, 8800a 8800b, and 8800bt mother boards all have the same orientation, slots running right to left. The IMSAI and others like Compupro, had mother boards running front to back, and actually had a card cage, whereas the Altair's used individual card guides attached to the mother board.
The only downside to using a non-Altair mother board for expansion, is that there are no provisions for attaching the card guides.
Just Bob!
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Keep your data bits in sequence, and your ribbons in the guides..."
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