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