Interrupt Controller; Interrupt Level Assignments - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

SIMMs install directly in the four sockets on the system board. The four sockets are
assigned as Bank 0 (2 sockets) and Bank 1 (2 sockets). All configurations have two SIMMs
installed in Bank 1.
SIMMs must be installed in pairs of the same memory type and size. Both sockets must be
populated within a bank for the system to work. No switch or jumper settings are required
when the memory is changed. The system BIOS automatically detects the SIMMs. See
"Checking the Memory in the System" in Section 3 for the valid configurations.

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
listed 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
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 (COM2)
Serial Port 1 (COM1)
Audio/LPT2 plug and play option/user-available
Diskette Drive Controller
Parallel Port 1 (LPT1)
Real-time clock
User-available
Technical Information 1-11