Interrupt Requests; System Interrupts; Interrupt Level Assignments - NEC PowerMate Professional 9000E Series Service Manual

This section provides information for configuring the system. The section
describes:
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system interrupt request (IRQ) assignments
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system board jumper settings
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descriptions of video modes
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the BIOS Setup utility to configure the system
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the Symbios Configuration Utility
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the FLASH utility
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NEC OS Restore CD
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NEC Select Install CD

Interrupt Requests

The following paragraphs list the system interrupts (IRQs), parallel addresses
and interrupts, and serial addresses and interrupts. Section 4, "System Board,"
includes information on system resources (memory map, I/O addresses, and
DMA settings).

System Interrupts

The system has 16 IRQs (IRQ 0 through 15) assigned to different devices (for
example, printer, modem, keyboard, or mouse). Initial IRQ settings are assigned
at the factory, with settings dependent on the installed device(s). Several IRQs
are unassigned for the installation of add-on devices. See "BIOS Setup Utility"
in this section for information on using the utility to assign or change the
interrupts.
The following table lists the IRQ settings. Note that assignments 0 through 15
are in order of decreasing priority.
Interrupt
INTR
NMI
IRQ0
IRQ1
IRQ2
IRQ3
2-2 System Configuration

Interrupt Level Assignments

I/O APIC level Description
INT0 Processor interrupt
N/A NMI from BUD to processor
INT2 Timer interrupt from PIIX4
INT1 Keyboard interrupt
Interrupt signal from second 8259 in PIIX4
Serial port A or B interrupt from 87309VLJ device (user
INT3
can configure)