Now I need
either a couple of 74194's or an M8330 board.
I don;t know if they have them,
but have you tried Cricklewood
Electronics? They had some 74(LS)95 chips when I needed them to
repair an old HP machine, and seem to be the only place that did.
Maybe worth considering if you have trouble finding TTL '194s is the
possibility that one of the CMOS logic families might do. Depending on
the surrounding circuitry, you may be able to use a 74ALS194 or
74HCT194 or maybe even a 74HC194 or some such instead of a real 74194.
Of course, depending on how non-original you're willing to be....
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