Asus P3C-D User Manual download pdf (Page 39)

ASUS P3C-L / P3C-S / P3C-LS User’s Manual 39

3. HARDWARE SETUP

DMA Channels

3. H/W SETUP

Both ISA and PCI expansion cards may require IRQs. System IRQs are available to

cards installed in the ISA expansion bus first, then any remaining IRQs are available

to PCI cards. Currently, there are two types of ISA cards.

The original ISA expansion card design, now referred to as legacy ISA cards, re-

quires that you configure the card’s jumpers manually and then install it in any

available slot on the ISA bus. To see a map of your used and free IRQs in Windows

98, the Control Panel icon in My Computer, contains a System icon, which gives

you a Device Manager tab. Double-clicking on a specific hardware device gives

you the Resources tab which shows the Interrupt number and address. Double-click

Computer to see all the interrupts and addresses for your system. Make sure that no

two devices use the same IRQ or your computer will experience problems when

those two devices are in use at the same time.

To simplify this process, this motherboard complies with the Plug and Play (PNP)

specification which was developed to allow automatic system configuration when-

ever a PNP-compliant card is added to the system. For PNP cards, IRQs are as-

signed automatically from those available.

The following table lists the default IRQ assignments for standard PC devices. Use

this table when configuring your system and for resolving IRQ conflicts.

Standard Interrupt Assignments

IRQ Priority Standard Function

0 1 System Timer

1 2 Keyboard Controller

2 N/A Programmable Interrupt

3* 11 Communications Port (COM2)

4* 12 Communications Port (COM1)

5* 13

6 14 Floppy Disk Controller

7* 15 Printer Port (LPT1)

8 3 System CMOS/Real Time Clock

9* 4 ACPI Mode when used

10* 5 IRQ Holder for PCI Steering

11* 6 IRQ Holder for PCI Steering

12* 7 PS/2 Compatible Mouse Port

13 8 Numeric Data Processor

14* 9 Primary IDE Channel

15* 10 Secondary IDE Channel

*These IRQs are usually available for ISA or PCI devices.

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Asus P3C-D User Manual Page 39