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Re: Resolving ISA card IRQ interference with PCI INTA# to IRQ assignment
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.
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?
>Micro Memory, Inc.
>(US) Tel 818 998 0070 x 318
>(US) Fax 818 998 4459