18 Oct
2007
18 Oct
'07
12:35 p.m.
On 18 Oct 2007 at 13:21, Doc Shipley wrote:
I don't know crap about USB or about ISA, but
would it be feasible to
just build a USB-attached ISA expansion board? Would that simpler than
attaching existing serial cards, floppy interfaces, etc., or would it
just further complicate things?
I'd think that it all depends on the speed desired. Single-byte
transfer over USB is very slow; the speed doesn't really kick in
until block transfers are being done. Interrupts and DMA might be
accommodated after a fashion, given enough intelligence on the box
end, but I'd just rather use an old ISA-equipped PC myself.
However, if what you're after is a "user port", there are USB-to-
bidirectional parallel port (with FIFO yet) (and serial port)
available very inexpensively.
Cheers,
Chuck