Thanks to John's pointer, I've got a CM153 card, so I might be able to
test my stash of CM100 drives at some point. Now I need to track down
the CM153 driver, and an old enough PC that it's got a chance of
working. Having an ISA slot is necessary but not sufficient; it also
requires a sufficiently slow CPU, and I'm not sure where the cutoff
is. Probably need a 286 or older.