Isn't that
the other way around, though: IDE controller -> bridge ->
MFM drive?
That doesn't make sense. IDE stands for Integrated Drive
Electronics, which means that the controller is located on the drive.
When this was done, the term "controller" migrated; it still (usually)
refers to the hardware that goes with the machine rather than the
drive. That is, the glue between the ISA/PCI/whatever bus and the
40-conductor cable (more recently, 40 conductors with 40 more
conductors used as shields) to the drive (including whatever
electronics may be onboard).
So, I think it does make sense.
Therefore IDE controller cards don't exist,
I'm sure this would come as quite a surprise to the people using them.
and you can't [bridge] IDE to an ST-412 interface
type drive.
I can't see why not. Bulding glue logic between two interfaces is, I
think, always possible (except in a few cases where the technology
isn't yet up to, say, handling the necessary data rates); it's just a
question of how complicated it'll be.
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