8-2
Specifications
Table 8-2
System Interrupts
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
Serial Port (COM 2)
IRQ 4
Serial Port (COM 1)
IRQ 5
Enhanced Business Audio
*
IRQ 6
Diskette Drive
IRQ 7
Parallel Port (LPT 1)
IRQ 8
Real-Time Clock (Not on ISA Bus)
IRQ 9
Free for PCI Use
IRQ 10
Free for PCI Use
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)
*
Default configuration; other configurations = IRQ7, IRQ9, IRQ10, None
Table 8-3
System DMA
Hardware DMA System Function
DMA 0
Unused
DMA 1
Business Audio (Default; Alternate = DMA0, DMA3, 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