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Have a customer with an old Mustek 600II scsi scanner using an Adaptec 2903 pci scsi card on a 98SE 1G Pentium III machine with a Biostar mb. Scsi card needs to be on an irq by itself, so I put it to irq 10. Reboot the machine, and it moves to irq 11 which is shared with other devices, and does not scan. Resources in bios are set to manual, even reserved irq 10, but it still moves back to 11 on a cold boot. Probably something I'm doing, but I would like the scsi card to stay on 10.
Have you checked for jumper settings on the card itself or tried moving it to a different slot away from other peripherals?
Addendum:Adaptec refference-
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The PCI specification allows the motherboard manufacturer to determine the IRQ assignment for each PCI device. Check with the motherboard / computer manufacturer for the specific PCI configuration details of your system.
Here are some basic steps that can assist the motherboard in correctly allocating resources to your PCI devices and / or resolve existing IRQ conflicts:
Move the PCI SCSI card to a PCI slot that is not forced to share an IRQ with any other PCI, AGP, or ISA slot - usually the PCI slots in the middle of the PCI expansion bus fit this description - you'll need to check with the motherboard / computer manufacturer for the specific PCI configuration details of your system.
Check with your video card / display adapter manufacturer to see if your specific video card requires an IRQ allocation - most motherboard CMOS / BIOS setup utilities have an option to disable the allocation of an IRQ to the AGP slot - disable this option only if you have verified that your video card does not require an IRQ.
Verify that all IRQs not specifically required for ISA devices are set to "Available" or "PNP ISA/PCI" in the motherboard CMOS / BIOS setup utility.
Verify that all devices not being used are disabled so that the resources they are being allocated can be freed up for allocation to another device - this is accomplished through the motherboard CMOS / BIOS setup utility (Example: if you're not using the onboard COM / Serial port on your motherboard, you can usually disable this chipset and free up the IRQ it's currently being assigned.)
tks for the response. no jumper settings on the card, plug and play. Adaptec just says to make it be on a high irq, and be the only thing on that irq. the mb has no isa slots, just pci with an agp slot. haven' tried different slot positon, but will do that.