System Interrupts; System Dma - Compaq Deskpro 2000 Maintenance & Service Manual

Hardware IRQ System Function
IRQ 0 Timer Interrupt (Not on ISA Bus)
IRQ 1 Keyboard (Not on ISA Bus)
IRQ 2 Interrupt Controller Cascade (Not on ISA Bus)
IRQ 3 Unused
IRQ 4 Serial Port (COM 1)
IRQ 5 Enhanced Business Audio (Default; Alternate = IRQ 7, IRQ 9, IRQ 10, None)
IRQ 6 Diskette Drive
IRQ 7 Parallel Port (LPT 1)
IRQ 8 Real-Time Clock (Not on ISA Bus)
IRQ 9 Unused
IRQ 10 Unused
IRQ 11 PCI Interrupt
IRQ 12 Mouse
IRQ 13 Coprocessor (Not on ISA Bus)
IRQ 14 IDE Interface (Hard Disk and Primary IDE Drive)
IRQ 15 CD-ROM (Secondary IDE/Drive)
Hardware DMA System Function
DMA 0 Unused
DMA 1 Business Audio (Default; Alternate = DMA 0, DMA 3, None)
DMA 2 Diskette Drive
DMA 3 ECP Parallel Port LPT1 (Default; Alternate = DMA 0)
DMA 4 DMA Controller Cascading (Not on ISA Bus)
DMA 5 Unused
DMA 6 Unused
DMA 7 Unused
Table 8-3

System Interrupts

Table 8-4

System DMA

Compaq Deskpro 2000 Series of Personal Computers 8-3