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Mitsubishi Electric Apricot LS660 Owner's Handbook Manual Page 34

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Direct memory access (DMA) channel
Base input/output (I/O) port address
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.
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
gives details of which ones may be available:
DMA
DMA0
DMA1
DMA2
Diskette/floppy disk controller
DMA3
Enhanced Capabilities Port (default)
DMA4
DMA5
DMA6
DMA7
I/O ports are used by the processor to communicate with hardware
devices. Some expansion cards are also controlled by I/O ports. The
base I/O port address specifies where the card's ports begin. The
following table lists the I/O ports used by devices on the
motherboard. Any ports not listed below may be available for an
expansion card. This extensive list continues on the next page.
I/O ports
000h-01Fh
020h-021h
034h, 038h, 03Ch
040h-05Fh
060h-06Fh
070h-07Fh
Default assignment
Default (8 bit) Audio
System
Default (16 bit) Audio
Default assignment
Interrupt controller 1
Alternate Local bus ATA/IDE
Keyboard controller
Real-time clock, NMI mask
LS/VS660 OWNER'S HANDBOOK
E x p a n s i o n c a r d s
Available?
Optionally
Optionally
Optionally
DMA controller 1
System timer
Yes
No
No
Yes
Yes
4/3

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