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DMA
DMA3
DMA4
DMA5
DMA6
DMA7
Base input/output (I/O) port address
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.
I/O ports
000h-01Fh
020h-021h
034h, 038h, 03Ch
040h-05Fh
060h-06Fh
070h-07Fh
080h-09Fh
0A0h-0A1h
0B4h, 0B8h, 0BCh
0C0h-0DFh
0F0h, 0F1h
0F8h-0FFh
1F0h-1F7h
200h-207h
220h-22Fh, 230h-233Fh
Default assignment
Enhanced Capabilities Port (default)
System
16-bit Audio
Default assignment
DMA controller 1
Interrupt controller 1
Alternate Local bus ATA/IDE
System timer
Keyboard controller
Real-time clock, NMI mask
DMA page register
Interrupt controller 2
Local bus ATA/IDE
DMA controller 2
Math coprocessor busy (clear/reset)
Math coprocessor
Hard disk drive controller
Game I/O (disable)
Sound blaster system
LS/VS 550 OWNER'S HANDBOOK
E x p a n s i o n C a r d s
Available?
Optionally
No
Optionally
Yes
Yes
4/5
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