Interrupt Controller; Interrupt Level Assignments - NEC POWERMATE PRO2180 - SERVICE MANUAL 1996 Service Manual

1-10 Technical Information

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 Section 1-4. 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.
Table Section 1-4 Interrupt Level Assignments
Interrupt Priority
NMI
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
IRQ08
IRQ09
IRQ10*
IRQ11*
IRQ12
IRQ13
IRQ14
IRQ15
* These slots are selected and used by the installed expansion boards.
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 (on multimedia configurations) or
User Available
Diskette Drive Controller
Parallel Port 1
Real-time clock
On-board audio (on multimedia
configurations) or User Available
User Available (SCSI board for SCSI
configurations)
Video board
On-board mouse port (available if no PS/2 mouse)
Reserved, Math Coprocessor
Primary IDE
Secondary IDE if present, or else user available