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APPENDIX A: Server Specifications
86
Interrupts
The following table reflects a typical configuration, but you can change these interrupts. Use
this information to determine how to program each interrupt.
Connector pinouts
Main power connector (J8)
Important
If you disable an IDE controller to free the interrupt for that controller, you must
physically unplug the IDE cable from the system board. Simply disabling the drive by
configuring the BIOS option does not make the interrupt available.
ISA Interrupt Description
IRQ0 8254 timer
IRQ1 Keyboard controller
IRQ2 Cascade for IRQ9
IRQ3 Free
IRQ4 Serial port
IRQ5 Hot-plug SCSI controller
IRQ6 Diskette controller
IRQ7 Free
IRQ8 Real-time clock
IRQ9 Generic, Option for SCI
IRQ10 VGA
IRQ11 USB
IRQ12 Mouse controller
IRQ13 Numeric data processor
IRQ14 Primary IDE controller
IRQ15 Secondary IDE controller
Pin Signal Name
1 +3.3 V
2 +3.3 V
3 Ground
4+5 V
5 Ground
6+5 V
7 Ground