WinXP doesn't really support Plug-n-Play ISA devices, but if
you've the WinXP-compatible device drivers for the ISA card, you
shouldn't any problems. (and, in a pinch, sometimes Win2K drivers
will work.) My first WinXP machine had an ISA modem that worked fine,
once I'd manually installed the drivers. For a more definitive
answer, consult the manufacturer of the specific I/O card you're
thinking of using.
--
Bruce Chambers
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