Unicorn ENDAT-3203M, Руководство пользователя

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User’s Manual
17
2-6. Assigning IRQs for Expansion Cards
Some expansion cards require an IRQ (Interrupt request vector) to operate. Generally, each
IRQ must be exclusively assigned to specific use. In a standard design, there are 16 IRQ
available with 11 of them already in used by other part of the system.
Microsoft's Diagnostic (MSD.EXE) utility included in the Windows directory can be used 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. The PCI and
PnP configuration in the BIOS setup utility can be used to indicate which IRQs have being
used by Legacy cards.
In the PCI Bus design, 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 2-5" 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
6 Used Floppy Disk
7 Used LPT1
8 Used RTC
9 Used LPT2 or Audio
10 Used COM4
11 Used LAN Adapter (on board)
12 Used PS/2 Mouse
13 Used Coprocessor
14 Used Hard Disk (IDE 1)
15 Used Reserved (IDE 2)