HW Conflict between SCSI controller & serial bus controller

[Marinus]

The onboard SCSI adapter (adaptec)on my Asus P2B-DS mainboard conflicts with the serial bus controller both use the IRQ 10. Therefore the adapter doesn't pick up the SCSI devices during the bios scanning. I have a Windows NT4 (sp6) operating system. How can I solve this conflict or how can I change the IRQ's?

[HokieStone]

When you say "Serial Bus Controller" do you mean "Universal Serial Bus Controller". Both devices are PCI devices and both can, under PCI, share the same IRQ 10. NT 4.0 likes the USB controller on 10, and the Adaptec should probably be hardwired to 10. Doesn't seem to be a problem, although I'm less familiar with 4.0 particulars.

Have you been in device manager to see if there are any conflicts; do the device status boxes say "device working properly" or does it state that there is a conflict?

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Jack of all trades, master of none.

[Marinus]

During the BIOS bootup it shows in the 'PCI list' that the "Serial Bus Controller" (can be USBC, I am not aware of the difference)and the 'Mass storage Controller'(which I assume is the SCSI adaptec controller) share the same IRQ 10.

During the system boot-up it doesn't therefore recognise any of my SCSI devices (it keeps re-scanning for SCSI devices till it jumps out of this re-scanning loop and boots the NT4 OS) so it doesn't even get to the OS. This problem (of shared IRQ's) started when I once set the PnP (Plug and Play) option in the BIOS to 'yes', even when I reversed this setting it kept sharing the same IRQ 10. SCSI termination settings and SCSI ID's are all set rigth since I never changed any of those and it worked perfect before.

Originally posted by HokieStone:
When you say "Serial Bus Controller" do you mean "Universal Serial Bus Controller". Both devices are PCI devices and both can, under PCI, share the same IRQ 10. NT 4.0 likes the USB controller on 10, and the Adaptec should probably be hardwired to 10. Doesn't seem to be a problem, although I'm less familiar with 4.0 particulars.

Have you been in device manager to see if there are any conflicts; do the device status boxes say "device working properly" or does it state that there is a conflict?

[HokieStone]

Does your BIOS have a "Reset Configuration" option in "Plug n' Play devices" module? And is the Bios PCI 2.0 compliant?

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Jack of all trades, master of none.

[Marinus]

The AWARD BIOS has PCI version 2.1 and has a reset option as well. However I found out the reason for the HW-conflict. The USB-port on-board (asus P2B-DS) had an IRQ conflict with the SCSI-Adaptec on-board it seems. Since, after I disabled the USB-port in the bios the SCSI got its unique IRQ and initialised and scanned the SCSI devices again. To me it seems strange that USB doesn't seem to work together with SCSI on the same board.

Originally posted by HokieStone:
Does your BIOS have a "Reset Configuration" option in "Plug n' Play devices" module? And is the Bios PCI 2.0 compliant?