B Reviewing System Interrupts; Interrupt Controller; Interrupt Level Assignments - NEC POWERMATE VE ETC Manual

Reviewing System
B
Interrupts

INTERRUPT CONTROLLER

The interrupt controller accepts requests from peripherals,
issues interrupt requests to the processor, resolves interrupt
priorities, and provides vectors for the processor to
determine which interrupt routine to execute. The interrupt
controller has priority assignment modes that can be
reconfigured at any time during system operations.
The interrupt levels are described in the following table.
Interrupt-level assignments 0 through 15 are in order of
decreasing priority. See Chapter 4, Setting System
Parameters, for information on changing the interrupts
using Setup.

Interrupt Level Assignments

INTERRUPT PRIORITY
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
INTERRUPT DEVICE
Counter/Timer
Keyboard
Cascade (INT output from slave)
COM2 and COM4
COM1 and COM3
Parallel Port 2/Audio (if present)
Diskette Drive Controller
Parallel Port 1
Reviewing System Interrupts B-1