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Reference Data 99
IRQ Usage
The following table lists the interrupt request lines (IRQs) that the system
typically uses and which ones are available for use by add-on devices.
IRQ Resource
NMI
0 System Timer
1 Keyboard
2Cascade
3 Serial port 2 (COM2)
4 Serial port 1 (COM1)
5 Secondary Parallel Port (LPT2)
6 Floppy Controller
7 Primary Parallel Port (LPT1)
8 Real Time Clock (RTC)
9 Cascade Redirect
10 Available
11 Available
12 PS/2 Mouse Port
13 Math Coprocessor
14 Primary Hard Disk
15 Secondary Hard Disk
4081TL.book Page 99 Tuesday, December 22, 1998 1:27 PM