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