Dell LM P-133ST manual Interrupt Assignments

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 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

System Overview 1-7