Interrupt Configuration
VL-586-1 Reference Manual
Configuration
–
35
CPU I
NTERRUPT
R
EQUEST
I
NPUTS
The seventeen standard IBM compatible interrupt inputs (IRQs) are shown below.
Table 11: Interrupt Request Inputs
Interrupt
Signal
Name
Interrupt
Number
Typical Source
of Interrupt on
an IBM AT
As Shipped
Configuration
Notes
NMI
—
IOCHCK from
PC/104 Bus.
PC/194 IOCHK
STD Bus NMIRQ* routed to CPU
NMI input, but can be
disconnected by removing a
jumper.
IRQ0
08h
Timer 0
Hardwired to
Timer 0
Internal signal, not available to
the outside world.
IRQ1
09h
Keyboard
Hardwired to
on-board
keyboard
controller.
DOS/BIOS expects keyboard
interrupts on this input.
IRQ2
0Ah
Slave Interrupt
Controller
Hardwired to
secondary PIC
Internal signal, not available to
the outside world.
IRQ3
0Bh
COM2
COM2
DOS/BIOS usually expects
COM2 interrupts on this input.
Comes from the on-board COM2
circuitry or from STD INTRQ.
Also connected to PC/104 bus.
IRQ4
0Ch
COM1
Hardwired to
COM1 and
PC/104
From COM1 circuits or PC/104
bus.
IRQ5
0Dh
LPT 2
STD Bus
Disconnected
IPC Interrupts or PC/104 bus.
IRQ6
0Eh
Floppy Disk
Hardwired
From floppy disk circuit or
PC/104 bus..
IRQ7
0Fh
LPT1
Hardwired
From printer port circuit or
PC/104 bus.
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