IRQs, PCI cards, and Windows 95
Posted on 1998-04-25
I have the following cards in my Pentium 233MMX Tyan motherboard with Windows 95:
Intel Etherexpress PCI network card (IRQ9)
Adaptec 2940UW SCSI PCI controller (IRQ11)
Creative Labs Sound Blaster AWE32 (IRQ5)
Matrox Millenium PCI video card (IRQ9)
Microtek E6 scanner SCSI card AIC-6x60 (Adaptec) (IRQ12)
And of course, COM1 (IRQ4), COM2 (IRQ3), LPT1 (IRQ7)
along with 2 Maxtor EIDE hard disks.
My questions are:
1) Am I correct in that PCI cards can share the same IRQ without any problem? In the above you will see the network card and the video card sharing the same IRQ 9.
2) If I check "Control Panel > System > Properties > Device Manager" and check the IRQ assignments, I also notice that there are 2 devices using IRQ14:
Standard Dual PCI IDE Controller
Primary IDE controller (single fifo)
Should this be a concern or worry? I.e., two on one IRQ?
3) I notice that two devices in the "View Resources/IRQ" list have tiny little blue "i" 's in a white circle, next to the device icon. What do they represent? Since I have two SCSI controllers on this PC, I see the SCSI icon twice in this list (for IRQ 11 and 12), however only one has the little "i" next to the SCSI icon. Why the difference in icons between the two SCSI devices?