E x p a n s i o n C a r d s
4/4 LS/VS 550 OWNER’S HANDBOOK
IRQ
Default assignment
Available?
IRQ9
Yes
IRQ10
Yes
IRQ11
Yes
IRQ12
Mouse
No
IRQ13
Coprocessor
No
IRQ14
Primary ATA/IDE interface
No
IRQ15
Secondary ATA/IDE interface
No
Note
Note
If you disable the interrupt which has been assigned to serial port 2 you
will disable the IR sensor used for the optional infra-red remote control.
IRQ3 is available if you disable serial port 2 with the BIOS Setup utility.
IRQ4 is available if you disable serial port 1.
Do not
disable either one unless you have no intention of using the
affected port. Similarly, if you have no intention of using the
parallel port, you can disable it with the BIOS Setup utility,
completely freeing IRQ7 for use by an expansion card.
Direct memory access (DMA) channel
Some hardware devices can use a DMA channel to access system
memory without directly burdening the processor. Computers have
DMA channels numbered DMA0 to at least DMA7.
The following table lists the DMA channels used by the computer
and shows which are available for use by expansion cards.
DMA
Default assignment
Available?
DMA0
Yes
DMA1
8-bit Audio
Optionally
DMA2
Diskette/floppy disk controller
No
