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Mitsubishi Electric Apricot LS 550 Owner's Handbook Manual Page 49

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E x p a n s i o n C a r d s
IRQ
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
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
DMA0
DMA1
DMA2
4/4
LS/VS 550 OWNER'S HANDBOOK
Default assignment
Mouse
Coprocessor
Primary ATA/IDE interface
Secondary ATA/IDE interface
Default assignment
8-bit Audio
Diskette/floppy disk controller
Available?
Yes
Yes
Yes
No
No
No
No
Available?
Yes
Optionally
No

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