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Compaq Deskpro EP Series of Personal Computers 6-3
6.1.3 DMA
Hardware DMA System Function
DMA 0 Unused
DMA 1 Audio (Alternate = DMA 0 or 3)
DMA 2 Diskette Drive
DMA 3 ECP Parallel Port LPT1 (Default; Alternate = DMA 0)
DMA 4 DMA Controller Cascading (Not on ISA Bus)
DMA 5 Unused
DMA 6 Unused
DMA 7 Unused
6.1.4 I/O
I/O Address (Hex) System Function (Shipping Configuration)
000 - 00F DMA Controller # 1
010 - 01F Unused
020 - 03F Interrupt Controller # 1
040 - 043 Counter/Timer
044 - 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
078 - 07F Unused
080 - 08F DMA Page Registers
090 - 091 Unused
092 Port A
093 - 09F Unused
0A0 - 0BF Interrupt Controller # 2
0C0 - 0DF DMA Controller # 2
0E0 - 0EB Unused
0EC - 0ED 483 Configuration Index/Data
0EE - 0EF 483 Fast A20/Fast Reset
0F0 - 0F1 Co-Processor Busy Clear/Reset
0F2 - 0F3 Unused
0F4 - 0F5 483 CPU Speed Slow/Fast
0F6 - 0F8 Unused
0F9 483/PGL Configuration Lock
Continued