Section III. Technical Principles of Operation of BECS Components
PORTABLE COMPUTER CP-1836/G (HP MODEL 110)
The Portable Computer CP-1836/G is a battery-powered computer with a
full-sized keyboard and a liquid-crystal display (LCD). The display shows 25
80-character lines of alphanumeric information, or 480-by-200 dots of
The display viewing angle can be adjusted by tilting the hinged top
The portable computer can be used at a fixed work station, or can be
carried to practically any location.
A typical work station might require
space for peripheral devices, such as a disc drive and a printer.
outlet is need for recharging the computers battery, and for recharging or
plugging in peripheral devices.
For portable use, the computer can be used almost anywhere, since it contains
its own battery power.
The computer is powered by a sealed rechargeable
6-volt lead-acid battery.
Battery-powered peripheral devices can also be
Peripheral devices are installed by connecting them to one of the two
input/output (1/0) receptacles, at the back of the computer.
Peripheral devices are connected in series between the computers IN
and OUT receptacles using interface cables. Cables are keyed to
ensure correct polarity.
One RS-232C compatible serial device can be connected to the serial
interface receptacle using a serial interface cable.
The portable computer uses software for configuring its settings, rather than
(such as switch settings).
The computers System
memory/Electronic disc consists of 512K bytes of random-access memory (RAM),
1024K bytes of read-only memory (ROM); and 8k bytes (expandable to 16K) of
programmable read-only memory) containing
specialized system information.
The partition of system memory and electronic
disc is configurable.
Built-in diagnostic tests verify proper operation of the computers basic
For a good unit, all tests will indicate ok. An error message
or failure code indicates that a test didnt pass and that service is required.
Installation isnt required to operate the portable computer. If the
computers battery is sufficiently charged (battery charge shows in the main
PAM screen), the unit is ready to operate as a stand-alone computer. If the
battery is insufficiently charged, the recharger is connected to the computer
and the computer can be used while its battery is recharging.
is 10 hours if the computer is turned off, and 18 hours if the computer is
DISC DRIVE RD-592/G (HP MODEL 91146)
The Disc Drive RD-592/G is a battery operated electronic storage device. Data
and programs from the computer are stored on a removable flexible disc used
with the disc drive.
The disc drive uses a 3 l/2-inch disc providing as much
as 710 thousand characters of storage capacity. The disc is similar to a
phonograph record that stores programs and data instead of music. The disc is
called a flexible or micro-flexible disc or media.
Data is stored on both
sides of the disc, and thus the name double-sided disc.