Unicorn ENDAT-586EL, Руководство пользователя

Страница: 19 / 58

13
The ENDAT-586EL All -In-One motherboard
2-5. Assigning IRQs for Expansion Cards
Some expansion cards require an IRQ (Interrupt request vector) to operate.
Generally, an IRQ must be exclusively assigned to one use. In a standard design,
there are 16 IRQ available with 11 of them already in used by other part of the
system.
Both ISA and PCI expansion cards may need to use IRQ. System IRQs are
available to cards installed in the ISA Expansion Bus first. Any remaining IRQ
then may be assigned to this PCI Bus. You can use Microsoft's Diagnostic
(MSD.EXE) utility included in the Windows directory to see their map. Make sure
that there are no two devices using the same IRQ in the system. Otherwise this will
cause the system to hang up or give unexpected results. To simplify the process,
this motherboard complies with the Plug and Play (PnP) specifications, which was
developed to allow automatic system configuration. Whenever a PnP-compliant
card is added to the system, PnP cards and IRQs are automatically assigned if
available. If the system has both Legacy and PnP ISA cards installed. IRQs are
assigned to PnP cards from those not used by Legacy cards. The PCI and PnP
configuration of the BIOS setup utility can be used to indicate which IRQs are
being used by Lega cy cards. For older Legacy cards that do not work with the
BIOS, you can contact your vendor for an ISA configuration utility.
An IRQ number is automatically assigned to PCI expansion cards after those used
by Legacy and PnP ISA cards. In the PCI Bus des ign, the BIOS is automatically
assigned an IRQ to a PCI slot that has a card in it which requires an IRQ. To install
a PCI card, you need to set the correct "ADSEL" and "INT" (interrupt) assignment.
Please refer to "Chapter 2-4" Installing a Riser Card for detail assignments.
IRQ Status Assignment
0 Used Timer
1 Used Keyboard
2 Used Second 8259
3 Used COM2
4 Used COM1
5 Used COM3 (Optional)
6 Used Floppy Disk