Tyan Tiger 100 (S1832) IO-APIC Problems

Hello all,

I have a Tyan Tiger 100 (S1832DL, Rev F) with a pair of PII 333 Deschutes.
 I have never been able to get this system up without the "noapic" boot
option.  I get lost interrupts on /dev/hda as soon as the IDE driver
attaches.  With noapic, the system boots fine and is rock-stable.  I have
used various kernels from 2.4.ancient though 2.4.24 with the same results.

I know the performance loss with all interrupts on CPU0 is supposed to be
small, but I am pushing this system hard and hope to squeeze a little more
out of it.  I would also like to upgrade to faster CPUs, but I don't want
to bother if the MoBo is broken or problematic.  Plus it just bugs me.  :)

I have searched the archives and Googled to my heart's content, but I
can't find anyone else having problems with this MoBo (it seems to be
fairly popular and reliable).  I have fiddled with all the BIOS settings
that had anything to do with PnP, MPS, PCI, IRQs, etc and yanked all the
PCI cards out.  Nothing seems to help and I have run out of ideas.  Can
anyone that has one of these offer any clues?  Is my APIC toast?

Thank you in advance,
Russ W. Knize