1.1
Description
Chapter
1
General Information
The
Portable PLUS Computer is a battery-powered computer with a full-sized keyboard
and
a liquid-
crystal display (LCD). The display shows
25
SO-character lines
of
alphanumeric information or 4S0-
by-200
dots
of
graphics. The display viewing angle can be adjusted by tilting the hinged top case.
Display contrast is adjustable by pressing the contrast key.
System memory/Electronic disc consists of 512K bytes of random-access memory
(RAM),
192K bytes
of
read-only memory (ROM);
and
SK
bytes (expandable to
16K)
of configuration EPROM (eraseable,
programmable read-only memory) containing specialized system information. The partition
of
system
memory
and
electronic disc is configurable.
The
central processing unit (CPU) is an
SOCS6
microprocessor.
Real-time clock with alarm, time zone, adjustable accuracy,
and
audio beeper functions are provided
for by the
146S05G2 peripheral processing unit (PPU).
The
computer is powered by a sealed rechargeable 6-volt lead-acid battery
and
can be used while the
battery is being recharged by the ac adapter.
The computer provides two external connectors for
input/output
(I/O)
operations: an HP-IL (Hewlett-
Packard Interface Loop) interface,
and
an RS-232-C/CCITT
V.24,
V.2S
compatible serial interface.
(CCITT stands for Comite Consultatif Internationale de Telegraphie et Telephonie).
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