At 06:00 PM 6/3/99 -0400, you wrote:
>Hardware setup:
>FIC 503+ 1.2a (w/out optional USB riser card)
>AMD 3d350
>64 PC100
>

<SNIP>

I've been there and done that!!  I spent three weeks reinstalling my OS
(Windows 98) and tweaking over and over with no success.  FINALLY I realized
that the FIC 503+ has a glitch with the VIA chipset and the IRQ addressing.  If
you go to their web site, you can download the "patch" which does correct this
problem.  http://www.fic.com.tw

Of course, I think this patch is only for Windows 95/98 and you didn't mention
the OS you are using, but hopefully this is the problem.

Good luck.

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