System Overview
1-17
Interrupt Assignments
Table 1-3. Interrupt Assignments
IRQ Line
Used By/Available
IRQ0
Generated by system timer
IRQ1
Generated by keyboard controller to indicate that keyboard’s out-
put buffer is full
IRQ2
Generated internally by interrupt controller to enable IRQ8
through IRQ15
IRQ3
and
IRQ4
Generated by super I/O controller to indicate that device con-
nected to corresponding serial port requires service (IRQ3 for
COM2 or COM4; IRQ4 for COM1 or COM3)
IRQ5
Available for use by expansion card unless this IRQ line is used
by secondary parallel port
IRQ6
Generated by super I/O controller to indicate that diskette or tape
drive requires service
IRQ7
Generated by super I/O controller to indicate that device con-
nected to parallel port requires service
IRQ8
Generated by keyboard controller for each tick of RTC
IRQ9
Available for use by expansion card
IRQ10
Available for use by expansion card
IRQ11
Available for use by expansion card
IRQ12
Generated by keyboard controller to indicate that mouse’s output
buffer is full
IRQ13
Generated by math coprocessor to indicate coprocessor error
IRQ14
Available for use by expansion card unless the IRQ line is in use
by the SCSI controller
IRQ15
Available for use
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