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6-4 Compaq Professional Workstation SP750 Maintenance and Service Guide
Hardware DMA
DMA 0
DMA 1
DMA 2
DMA 3
DMA 4
DMA 5
DMA 6
DMA 7
I/O Address (Hex)
000 - 00F
010 - 01F
020 - 021
02E - 02F
040 - 043
044 - 04D
04E - 04F
050 - 05F
060
061
062 - 063
064
065 - 06F
070 - 071
072 - 077
072 - 07F
080 - 08F
090 - 091
Table 6-3
System Direct Memory Access (DMA)
System Function
Business Audio (default; alternate = DMA0, none)
Business Audio (default; alternate = DMA0, DMA3, none)
Diskette drive
ECP parallel port LPT1 (default; alternate = DMA 0)
DMA controller cascading
Unused
Unused
Unused
Table 6-4
System I/O
System Function (Shipping Configuration)
DMA controller # 1
Unused
Interrupt controller # 1
Super I/O index/data registers
Counter/timer
Unused
Super I/O index/data register alternate
Unused
Keyboard controller
Port B
Unused
Keyboard controller
Unused
NMI enable/real-time clock
CMOS storage
Unused
DMA page registers
Unused
continued
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