User`s manual

Appendix B
RUBY-9719VG2AR User’s Manual
Interrupt Request Lines (IRQ)
Peripheral devices can use interrupt request lines to notify CPU for the service
required. The following table shows the IRQ used by the devices on board.
IRQ# Current Use Default Use
IRQ 0
System ROM System Timer
IRQ 1
System ROM Keyboard Event
IRQ 2
Unassigned Usable IRQ
IRQ 3
System ROM COM2
IRQ 4
System ROM COM1
IRQ 5
Unassigned Usable IRQ
IRQ 6
System ROM Diskette Event
IRQ 7
Unassigned Usable IRQ
IRQ 8
System ROM Real-Time Clock
IRQ 9
Unassigned Usable IRQ
IRQ 10
Unassigned Usable IRQ
IRQ 11
Unassigned Usable IRQ
IRQ 12
System ROM IBM Mouse Event
IRQ 13
System ROM Coprocessor Error
IRQ 14
System ROM Hard Disk Event
IRQ 15
Unassigned Usable IRQ