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2-29
Box PC 820 / PC FI45 V2, Manual
A5E00051531-03
2.9
Interrupt Assignments
Interrupt Assignments
Two integral interrupt controllers of the type 82C59 handle the 16 hardware inter-
rupts (IRQ 0 to IRQ 15).
The INT output of the slave controller is connected to the IRQ 2 input of the master
controller. Interrupt 9 (IRQ 9) can be used on the bus for the assigned interrupt 2
(IRQ 2). In the initialization phase, IRQ 9 is programmed for the software interrupt
vector 0A H (IRQ 2) by the ROM-BIOS.
Priority
The interrupts are priority-scheduled in reverse number order. Interrupt IRQ 0 has
the highest priority and interrupt IRQ 7 the lowest. For triggering IRQ 2, interrupt
IRQ 8 has the highest priority and interrupt IRQ15 the lowest.
Interrupts IRQ 8 to IRQ 15 therefore have priority over interrupts IRQ 3 to IRQ 7.
The interrupt vectors are initialized and masked when the PC is powered up.
I/O Addresses of the Interrupt Controllers
Interrupt
Assignment
Remark
Vector
SMI
System management interrupt, cannot
be masked
-
-
NMI
Signal IO channel check 2
Fixed
INT2H
IRQ 0
Timer output 0
Fixed
INT8H
IRQ 1
Keyboard
Fixed
INT9H
IRQ 2
Cascaded (slave interrupt controller)
Fixed
INTAH
IRQ 3
Serial port 2
Can be switched off *)
INTBH
IRQ 4
Serial port 1
Can be switched off *)
INTCH
IRQ 5
Sound
Vacant
INTDH
IRQ 6
FD controller
Can be switched off *)
INTEH
IRQ 7
Parallel port 1
Can be switched off *)
INTFH
IRQ 8
Real-time clock (RTC)
Fixed
INT70H
IRQ 9
VGA (generally not used)
Vacant (AT 9 = XT 2)
INT71H
IRQ 10
MPI/DP
P&P **)
INT72H
IRQ 11
Reserved for SafeCard on motherboard
Reserved
INT73H
IRQ 12
PS/2 mouse
Can be switched off *)
INT74H
IRQ 13
Numeric processor
Fixed
INT75H
IRQ 14
1st HD controller (primary)
Fixed
INT76H
IRQ 15
2nd HD controller (secondary)
Can be switched off *)
INT77H
Do not use interrupts already assigned in the system.
*)
These components can be disabled via the BIOS SETUP. The functions are then no longer
available and the resources are released for other components.
**)
The Onboard MPI/DP interface is Plug&Play capable, the occupied resources are managed
by the BIOS.
Motherboard
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