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AST RESEARCH TECHNICAL BULLETIN TB-0034 7-18-84
HARDWARE INTERRUPT ASSIGNMENT IN THE IBM PC AND XT
When interfacing products to the IBM PC or XT, which use hardware
interrupts, it is necessary to insure their is not conflict with
other devices in the system utilizing the same interrupt.
The following table shows the hardware interrupts and their
assignments.
INTERRUPT IBM ASSIGNMENT ADD-ON ASSIGNMENT
IRQ NMI PARITY NONE
IRQ 0 TIMER NONE
IRQ 1 KEYBOARD NONE
IRQ 2 RESERVED AST-SNA, AST-BSC,
AST-3780, AST-5251
AST-PCNET
IRQ 3 COM 2 AST COM 2, AST-SNA
IBM-SDLC AST-BSC, AST-3780,
IBM-BSC (Secondary) AST-5251, AST-PCNET
IRQ 4 COM 1 AST COM 1, AST-SNA
IBM-SDLC AST-BSC, AST-3780
IBM-BSC (Primary) AST-5251, AST-PCNET
IRQ 5 IBM-HARD DISK SAME AS IRQ 2
IRQ 6 IBM-FLOPPY DISK AST-SNA, AST-BSC
AST-3780, AST-5251
IRQ 7 PRINTER SAME AS IRQ 6