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

[Carter Buck <CBuck@PLXTech.com>]

Some motherboards do not support both an ISA card and a PCI card in 
immediately adjacent ISA and PCI slots.  Also some motherboards support 
only a PCI slave device (not a master) in a sixth PCI slot.

Carter Buck

At 03:39 PM 10/17/01, Mike Jadon wrote:

>>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