Technical Reference 69 Interrupts Table 33. Interrupts IRQ System Resource NMI I/O channel check 0 Reserved, interval timer 1 Reserved, keyboard buffer full 2 Reserved, cascade interrupt from slave PIC 3 COM2* 4 COM1* 5 LPT2 (Plug and Play option) / ** 6 Floppy drive controller 7 LPT1* 8 Real time clock 9 ** 10 ** 11 ** 12 Onboard mouse port (if present, else user available) 13 Reserved, math coprocessor 14 Primary IDE (if present, else user available) 15 Secondary IDE (if present, else user available) * Default, but can be changed to another IRQ. ** Dynamically allocated for all PCI/AGP devices and slots.
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