Interrupt Controller; Interrupt Level Assignments - NEC POWERMATE P60D Service Manual

The system board's four SIMM sockets are assigned as banks A and B. Each SIMM kit
is inserted into a pair of sockets or bank. Bank A consist of sockets J28 and J27, and in
the desktop version can only accommodate low profile (1-, 2-, and 4-MB) SIMM sticks.
Bank B consist of sockets J25 and J26. Different size SIMMs cannot be intermixed
within a bank. See Section 3, Options, for installation instructions and SIMM memory con-
figurations.

Interrupt Controller

The interrupt controller operates as an interrupt manager for the entire AT system environ-
ment. 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 listed in Table Section 1-7. Interrupt-level assignments 0 through 15
are in order of decreasing priority. See Section 2, Setup and Configuration, for information
on changing the interrupts using Setup.
Table Section 1-7 Interrupt Level Assignments
Interrupt Priority
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
IRQ08
IRQ09
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
*Industry standard locations
Technical Information
Interrupt Device
Counter/Timer
Keyboard
Cascade (INT output from slave)
COM2*
COM1*
Parallel Port 2
Diskette Drive Controller*
Parallel Port 1*
Real-time clock
Available
Available
Available
PS/2 mouse*
Coprocessor
Primary IDE (fast)
Secondary IDE (standard)
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