Compaq 470007-802 Deskpro EN Series of Personal Computers Maintenance and Serv - Page 89
System Interrupts, System DMA, Hardware IRQ, System Function
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6.1.2 System Interrupts 6.1.3 Hardware IRQ 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 System Function Timer Interrupt Keyboard Interrupt Controller Cascade Serial Port (COM B) Serial Port (COM A) Audio Diskette Drive Parallel Port (LPT 1) Real-Time Clock Available for PCI Available for PCI Available for PCI Mouse Coprocessor Primary IDE Controller Secondary IDE Controller System DMA Hardware DMA 0 1 2 3 4 5 6 7 System Function Unused Unused Diskette Drive ECP Parallel Port LPT1 (Default; Alternate = DMA 0) DMA Controller Cascading Unused Unused Unused 6-2 Specifications
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6-2
Specifications
6.1.2
System Interrupts
Hardware IRQ
System Function
0
Timer Interrupt
1
Keyboard
2
Interrupt Controller Cascade
3
Serial Port (COM B)
4
Serial Port (COM A)
5
Audio
6
Diskette Drive
7
Parallel Port (LPT 1)
8
Real-Time Clock
9
Available for PCI
10
Available for PCI
11
Available for PCI
12
Mouse
13
Coprocessor
14
Primary IDE Controller
15
Secondary IDE Controller
6.1.3
System DMA
Hardware DMA
System Function
0
Unused
1
Unused
2
Diskette Drive
3
ECP Parallel Port LPT1 (Default; Alternate = DMA 0)
4
DMA Controller Cascading
5
Unused
6
Unused
7
Unused