On Apr 30, 11:28 am, Tim Wescott wrote:

I got curious when I should have been doing some productive work and
found some USB to ISA adapters out there. It presumably requires some
really oddball drivers, but they seemed to feel it would even work in
DOS, as long as you were running it out of Windows.

Very unlikely to work for machine control purposes. USB has a very
high latency delay, so even if you manage to successfully fake out the
software and tunnel everything over the USB to the ISA emulator, it
will be extremely slow, way too slow for any kind of bus-in-the-loop
or realtime application.

You see the same problem even with USB-serial adapters - send blocks
of characters and everything is fine, but try to have two devices
interact character-by-character and the latency kills you.