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7-3
Compaq Professional Workstation AP500 Maintenance and Service Guide
Table 7-2
System Interrupts
Hardware IRQ System Function
IRQ 0 System timer
IRQ 1 Keyboard (not on ISA Bus)
IRQ 2 Used by Interrupt Controller 2
IRQ 3 Serial port (COM 2)
IRQ 4 Serial port (COM 1)
IRQ 5 ESS sound chip
IRQ 6 Diskette drive
IRQ 7 Parallel port (LPT 1)
IRQ 8 Real-time clock
IRQ 9 Unavailable (used for ACPI support)
IRQ 10 Unused
IRQ 11 PCI Interrupts
IRQ 12 Mouse
IRQ 13 Non-catastrophic errors/CPU error
IRQ 14 Primary IDE controller
IRQ 15 Secondary IDE controller
Table 7-3
System Direct Memory Access (DMA)
Hardware DMA System Function
DMA 0 Business audio (default)
DMA 1 Business audio (default)
DMA 2 Diskette drive
DMA 3 ECP Parallel port LPT1 (default)
DMA 4 DMA Controller cascading (not on ISA Bus)
DMA 5 Unused
DMA 6 Unused
DMA 7 Unused