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Mitsubishi Electric apricot MS660 Owner's Handbook Manual Page 53

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E x p a n s i o n c a r d s
Direct memory access (DMA) channel
Base input/output (I/O) port address
5/4
MS660 OWNER'S HANDBOOK
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
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
080h-09Fh
0A0h-0A1h
0B4h, 0B8h, 0BCh
Default assignment
8-bit Audio
Diskette/floppy disk controller
System
16-bit Audio
Alternate Local bus ATA/IDE
Real-time clock, NMI mask
Available?
Optionally
Optionally
Default assignment
DMA controller 1
Interrupt controller 1
System timer
Keyboard controller
DMA page register
Interrupt controller 2
Local bus ATA/IDE
Yes
No
No
No
Yes
Yes

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