Mitsubishi Electric Apricot XEN pentium Owner's Handbook Manual page 122

Inside your computer
Selecting IRQs for cards
The table below lists the interrupts available on the
motherboard and their default functions. The notes explain
whether the default function can be disabled, if so how, and
under what circumstances it is safe to do so.
Interrupts
IRQ5, IRQ9
IRQ10, IRQ11
IRQ7
IRQ15
IRQ3
IRQ4
IRQ1
IRQ6
IRQ8
IRQ12
IRQ14
A/6 XEN OWNER'S HANDBOOK
Default Notes
Function
Not used These interrupts are not used by
the motherboard and are available
for expansion cards.
Parallel port IRQ7 is not normally used, and can
be used by expansion cards without
affecting the operation of the
parallel port. It is possible for
software to enable the parallel
port's use of IRQ7. This is rare but
could cause problems with a card
using IRQ7.
If you are not using the parallel port
it can be disabled using SETUP,
freeing IRQ7 to be used by an
expansion card.
Secondary IDE This interrupt can be used if a
interface secondary IDE interface is disabled,
or not fitted.
Serial port 2 Each of the serial ports, can be
Serial port 1 individually disabled using SETUP.
When a port is disabled, the
interrupt assigned to it is free and
can be used by an expansion card.
You should only disable a port if you
are certain that you will not be
using it.
Keyboard These interrupts cannot be used
Floppy disk controller by an expansion card under any
Real time clock circumstances.
Mouse
Hard disk controller