Parallel Port Interrupts; Interrupt Level Assignments - NEC PowerMate VT 300i Series Service And Reference Manual

Interrupt Priority
NMI
IRQ00
IRQ01
IRQ02
IRQ03
IRQ04
IRQ05
IRQ06
IRQ07
IRQ08
IRQ09
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
* In Plug and Play systems, these interrupts are typical but may vary by configuration.

Parallel Port Interrupts

The parallel port I/O interrupts are given in the following table. The table lists
all of the possible configurations but the port only uses one set. Any interrupts
used for the built-in parallel port are not available for ISA parallel ports.
Port
LPT1
LPT2
LPT3
LPT1
LPT2
LPT3

Interrupt Level Assignments*

Interrupt Device
I/O Channel Check
System Timer
Keyboard
Programmable Interrupt Cascade
COM2*
COM1*
LPT2 (plug and play option)/Audio integrated on system
board/User available
Diskette Drive Controller
Parallel Port 1
Real-Time clock
User Available
User Available
User Available (used by network board if present)*
Mouse
Reserved, Math Coprocessor
Primary IDE
Secondary IDE

Parallel Port Interrupts

Interrupt
IRQ05
IRQ05
IRQ05
IRQ07
IRQ07
IRQ07
System Configuration 2-3