HP Vectra User Manual

The 8254 occupies four port addresses; three are used to load
count values into each
of the timer channels, the fourth is used as
a command and status port. The port addresses are listed in the
following chart.
ADDRESS
PORT
040H Channel 0 counter
041H Channel 1 counter
042H Channel 2 counter
043H
Command register
Processor Board 19

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