NEC POWERMATE PRO2180 - SERVICE 1997, Service Manual

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1-10 Technical Information
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 jumpers required setting
when the memory is changed. The system BIOS automatically detects the SIMMs. See
“Checking the Memory in the System” in Section 3 of the PowerMate Pro2200/2180
Service and Reference Manual 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 1-4. Interrupt-level assignments 0 through 15 are
in order of decreasing priority. See Section 2 of the PowerMate Pro2200/2180 Service and
Reference Manual for information on changing the interrupts using the Setup Utility.
Table 1-4
IRQ Assignments
Interrupt Assignment
BASE System Multimedia System SCSI System
0 System Timer System Timer System Timer
1 Keyboard Keyboard Keyboard
2 (9) Available Sound (internal on MM systems)
MIDI I/O Sound (internal on MM systems)
MIDI I/O
3 Serial Port B - Com2 Serial Port B - Com2 USB Serial Port
4 Serial Port A - Com1 Serial Port A - Com1 Serial Port A - Com1 (shared)
Serial Port B - Com2 (shared)
5 Available Sound (internal on MM systems)
Sound Blaster Sound (internal on MM systems)
Sound Blaster
6 Floppy Disk Floppy Disk Floppy Disk
7 Parallel Port - LPT1 Parallel Port - LPT1 Parallel Port - LPT1
8 Clock/Calendar Clock/Calendar Clock/Calendar
10 USB Serial Port USB Serial Port SCSI adapter
11 Video Adapter Video Adapter Video Adapter
12 Mouse Mouse Mouse
13 Coprocessor Coprocessor Coprocessor
14 IDE port A IDE port A IDE port A
15 IDE port B IDE port B IDE port B