Now I need either a couple of 74194's or an M8330
board.=20
The former being a lot easier to find than the latter, quite apart from
the moral aspect of keeping the machine as original as possible.
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.
-tony