Resolving ISA card IRQ interference with PCI INTA# to IRQ assignment

[Mike Jadon <mikej@umem.com>]

> We have a
> 64-bit/33MHz PCI card which uses INTA# and has no ROM BIOS extension
> (even though space has been provided for it) which prevents a PC from
> booting if it installed in a particular PCI slot, and an ISA is installed
> in a corresponding ISA slot. If either of these cards are moved to
> different slots on their respective busses the system will
> boot.
>  
> The theory is that the PCI card is getting
> assigned the same IRQ as the ISA card. Does anyone know of a BIOS
> mechanism which we could use in a ROM BIOS extension to ensure there are
> no IRQ conflicts between the ISA card(s) and our PCI card?
>  
> Mike Jadon
>

Mike Jadon
Micro Memory, Inc.
(US) Tel 818 998 0070 x 318
(US) Fax 818 998 4459
mikej@umem.com
www.umem.com
9540 Vassar
Chatsworth, Ca.
USA 91311