55
Interrupts
Default
Notes
Function
IRQ9
Video
IRQ9 is not normally used in the XEN-LS II implementation
and can be used by an expansion card.
IRQ7
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.
IRQ3
Serial port 2
Each of the serial ports, can be individually disabled using
IRQ4
Serial port 1
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.
IRQ5
SLCD
The SLCD interface can be disabled using SETUP if you do
interface
not have an SLCD CD-ROM drive fitted. In this case IRQ5 is
available for an expansion card.
IRQ10
INA
The Ethernet interface can be disabled using SETUP if you
(Ethernet)
are not using the on-board Ethernet adapter to connect to a
network. In this case IRQ10 is available for an expansion
card.
IRQ15
Audio
The audio system can be disabled using SETUP if you are
not using it. In this case IRQ15 is available for an expansion
card.
IRQ14
Hard disk
The hard disk controller can be disabled using SETUP in a
controller
XEN-LS II which is not equipped with a hard disk. In this
case IRQ14 is available for an expansion card.
Warning: Disabling the hard disk controller should only be
contemplated on machines which are not equipped with a
hard disk.
IRQ1
Keyboard
These interrupts cannot be used by an expansion card
IRQ6
Floppy disk
under any circumstances.
controller
IRQ8
Real time clock
IRQ11
Security
IRQ12
Mouse
Note
In an ISA compatible system if you select IRQ2 on an expansion
card it uses IRQ9. This means that if an expansion card is using
IRQ2, no other card can use IRQ9.
Refer to the table above, and the documentation supplied with the
card to establish which IRQ, if any, to use and how to select it.
