16 SB-6862
System Interrupts

The processor has two controllers, supplying 16 IRQs.

Below are assignments in decreasing priority.

LEVEL FUNCTION
Microprocessor NMI Parity or I/O Channel Check
Interrupt Controllers
Ctlr 1 Ctlr 2
IRQ0
IRQ1
IRQ2
*Interrupts IRQ8 - IRQ15 redirected to IRQ2*
IRQ8 Real-Time clock interrupt
IRQ9 Software re-directed to INT + AH (IRQ2)
IRQ10 Reserved
IRQ11 Reserved
IRQ12 Reserved
IRQ13 Coprocessor
IRQ14 Fixed disk controller
IRQ15 Reserved
IRQ3 Serial port 2
IRQ4 Serial port 1
IRQ5 Parallel port2
IRQ6 Diskette controller
IRQ7 Parallel port 1