Ok, on the Compaq, I've gotten into BIOS settings, and here's what I noticed:

ATI VGA Controller: IRQ 11
1394 Controller: IRQ 11
Ethernet Controller: IRQ 11
Adaptec SCSI Controller: Enabled <-- I believe this is the firewire card
Intel USB Controller: IRQ 11

PCI Bus Mastering: Disabled
PCI Reset on Warm Boot: Enabled
PCI VGA Palette Snopping: Disabled