#PVR & IRQs
02-Oct-95 10:34:59
Sb: #193297-#PVR & IRQs
Fm: David Rhoten 71450,2654
To: Daniel B. Douglas 102570,2131
There's NO way you can assign anything IRQ 0 — it's a reserved IRQ (as you've
found).
I discovered, when installing my 3Com Etherlink III PCI network adapter that in
order to keep it from auto-installing itself to IRQ 9 (which was causing
problems), I had to go into the plug & play options in the BIOS config program,
where there are some PCI options to tell PCI-based cards what IRQ's are in use
by ISA-based cards. I set IRQ 9 to "used" until the install routine for the
card was done — then I went back to the BIOS and re-set the IRQ to "free".
Go into your BIOS config and, if you have a plug-and-play BIOS (or in some
machines, the P-n-P part can be enabled/disabled — so _if_ it's enabled),
verify that at there is at least one "free" IRQ listing for each PCI card you
have installed. Normally, the IRQ's listed are 5,9,10 and 11. Make sure that
any IRQ's used by your ISA cards are marked as "used", and, as I said, insure
that you still have enough free to assign one to each PCI board installed
(except if your main disk controller is on a PCI card, as the disk IRQ's are
pre-reserved by the BIOS). Also, check jumper settings on the board and the
settings in/on the initialization software.
Dave