Dell PowerEdge 2200 Service Manual - Page 25
Interrupt Assignments, Table 1-3.
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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 output 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 connected 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 connected 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 System Overview 1-17
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