Mitsubishi Electric apricot ls/vs550 Owner's Handbook Manual page 26

Direct memory access (DMA) channel
IRQ Default assignment
IRQ8 Real time clock
IRQ9
IRQ10
IRQ11
IRQ12 Mouse
IRQ13 Coprocessor
IRQ14 Primary ATA/IDE interface
IRQ15 Secondary ATA/IDE interface
*If SCSI is used in place of IDE, 'Plug and Play' can place SCSI controller in
one of these.
With the BIOS Set-up utility IRQs 3 and 4 are available if you
disable serial ports 2 and 1 respectively. Similarly, if you have no
intention of using the parallel port, you can disable it with the
BIOS Set-up utility, freeing IRQ7. Do not disable ports unless you
have no intention of using them.
Some hardware devices can use a DMA channel to access system
memory without directly burdening the processor. Computers have
DMA channels numbered DMA0 to 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 Diskette/floppy disk controller
DMA3
DMA4
DMA5
DMA6
DMA7
Default assignment
Default audio (8 bit)
ECP printer port(default)
DMAC daisy chain
Default audio (16 bit)
LS/VS550 OWNER'S HANDBOOK
E x p a n s i o n
Available?
No
Yes*
Yes*
Yes*
No
No
Optionally*
Optionally*
Available?
Yes
Optionally
No
Optionally
No
Optionally
Yes
Yes
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