Interrupt Controller; Interrupt Level Assignments - NEC POWERMATE P - SERVICE MANUAL 1995 Service And Reference Manual

Interrupt Controller

The interrupt controller operates as an interrupt manager for the entire system environment.
The 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 Table 1-5. Interrupt-level assignments 0 through 15 are
in order of decreasing priority. See Section 2, "Setup and Operation", for information on
changing the interrupts using Setup.
Interrupt Priority
NMI
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
IRQ08
IRQ09
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
Table 1-5 Interrupt Level Assignments
Interrupt Device
I/O channel check
Reserved, Interval Timer
Reserved, Keyboard buffer full
Reserved, Cascade interrupt from slave
Serial Port 2
Serial Port 1
On-board audio (default) or Parallel Port 2
Diskette Drive Controller
Parallel Port 1
Real-time clock
User Available
User Available
User Available
On-board mouse port (available if no PS/2 mouse
Reserved, Math Coprocessor
Primary IDE
Secondary IDE if present, or else user available
Technical Information 1-11