HP Vectra User Manual

The following table defines the port addresses for the DMA
controller.
Table 2.3
DMA Port Assignments
PORT
ADDRESS Ie REGISTER
OOOOH DMA # 1
Ch 0 Address
0OO1H Ch 0 Count
0OO2H Ch 1 Address
0OO3H
Ch 1 Count
0OO4H Ch 2 Address
OOOSH Ch 2 Count
0OO6H Ch 3 Address
0OO7H Ch 3 Count
0OO8H Read StatuslWrite Command
0OO9H Write Request
OOOAH Write Single Mask Register Bit
OOOBH
Write Mode Register
OOOCH Clear Byte Pointer Flip-flop
OOODH
Read Temporary ReglWrite
Master
Clear
OOOEH
Clear Mask Register
OOOFH
Write All Mask Register Bits
0081H Page Reg
Channel 2 A 16 - A23
0082H
Channel 3 A 16 - A230083H
0083H
Channel 1 A 16 - A23
0087H
Channel 0 A 16 - A23
0089H
Channel 6 A 17 - A23
008AH
Channel 7 A 17 - A23
008SH
Channel 5 A 17 - A23
008FH Refresh
26 Processor Board

HP Vectra Specifications

General

Processor	Intel Pentium
RAM	Up to 128 MB
Storage	HDD (capacity varies by model)
Operating System	Windows 95
Graphics	Integrated
Ports	Serial, Parallel
Expansion Slots	ISA, PCI