HP Vectra User Manual

PORT
ADDRESS
OOCOH
OOC2H
OOC4H
OOC6H
OOC8H
OOCAH
OOCCH
OOCEH
OODOH
OOD2H
OOD4H
OOD6H
OOD8H
OODAH
OC)DCH
OODEH
Ie
DMA# 2
REGISTER
Ch 4 Address
Ch 4 Count
Ch 5 Address
Ch 5 Count
Ch 6 Address
Ch 6 Count
Ch 7 Address
Ch 7 Count
Read Status / Write command
Write Request
Write Single Mask Register Bit
Write
Mode Register
Clear Byte Pointer Flip-flop
Read Temporary ReglWrite
Master Clear
Clear Mask Register
Write All Mask Register Bits
Note, the I/O ports for DMA controller 1 (for 8-bit transfers) are
located on consecutive addresses,
while the ports for controller 2
are
on even-byte addresses. All registers should be loaded with
valid parameters after power-up or reset. This should be done
even if some channels are unused.
Processor Board 27

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