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System Overview
1-19
I
nterrupt Assignments
Table 1-4. 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 an expansion card.
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 an expansion card.
IRQ10
Available for use by an expansion card.
IRQ11
Available for use by an expansion card. Default PCI IRQ.
IRQ12
Generated by keyboard controller to indicate that mouse’s output
buffer is full.
IRQ13
Generated by math coprocessor to indicate coprocessor error.
IRQ14
Generated by device connected to primary EIDE port to indicate
that device requires service. If the EIDE controller is disabled, this
line is available for other use.
IRQ15
Generated by device connected to secondary EIDE port to
indicate that device requires service. If the EIDE controller is
disabled, this line is available for other use.
Summary of Contents for OptiPlex Gs
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