Interrupt Assignments

Table 1-1. Interrupt Assignments

IRQ Line

Used/Available

IRQ0

Generated by the system timer

IRQ1

Generated by the keyboard controller to signal that the keyboard

output buffer is full

IRQ2

Generated internally by the interrupt controller to enable IRQ8

through IRQ15

IRQ3

Available for use by a PC Card unless the built-in serial port or

infrared port is configured for COM2 (the default)

IRQ4

Available for use by a PC Card unless the built-in serial port is

configured for COM1 (the default)

IRQ5

Available for use by the audio controller

IRQ6

Generated by the diskette drive controller to indicate that the

diskette drive requires the attention of the microprocessor

IRQ7

Available for use by a PC Card or audio controller if the built-in

parallel port is disabled

IRQ8

Generated by the system I/O controller's RTC

IRQ9

Available for use by the PC Card interrupt controller or the

audio controller

IRQ10

Available for use by a PC Card or audio controller unless the

Advanced Port Replicator is attached

IRQ11

Available for use by a PC Card unless the Advanced Port Repli-

cator is attached

IRQ12

Generated by the keyboard controller to indicate that the output

buffer of the integrated trackball or external PS/2 mouse is full

IRQ13

Reserved for use by the internal coprocessor

IRQ14

Generated by the hard-disk drive to indicate that the drive

requires the attention of the microprocessor

IRQ15

Reserved for the CD-ROM drive

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