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System Overview 1-7
I
nterrupt Assi
g
nments
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 key-
board output buffer is full
IRQ2 Cascade to second interrupt controller
IRQ3 Used by the infrared port (COM2)
IRQ4 Used by the serial port (COM1)
IRQ5 Used by the audio controller
IRQ6 Generated by the diskette drive controller to indicate that the
diskette drive requires the attention of the microprocessor
IRQ7 Used by the parallel port
IRQ8 Generated by the system RTC
IRQ9 Software redirect to INTOA
IRQ10 Reserved
IRQ11 Reserved
IRQ12 Generated by the keyboard controller to indicate that the out-
put buffer of the integrated touch pad or external PS/2 mouse
is full
IRQ13 Used by the math coprocessor on the microprocessor
IRQ14 Generated by the hard-disk drive to indicate that the drive
requires the attention of the microprocessor
IRQ15 Reserved