INTRODUCTION
1.1
SYSTEM OVERVIEW
The
TRS-SO
Model4P
Microcomputer
is
a complete, self-con-
tained portable (transportable) version of the popular
TRS-SO
Model 4 Microcomputer.
It
provides a carrying/protective case
which
has
a
recessed
carrying
handle,
removable
front
cover
which protects the CRT and disk drives and serves as a base
when in the portable configuration, and self-contained key-
board
conveniently
stowed
away
in
a
recess
in
the
main
case.
Power cord, floppy disk and manual storage are provided in-
side
the
removable
cover/base.
All
connections
to
peripheral
equipment are made at the rear of the Model 4P and optional
feature
connections
are
made
by
removing
a
rear
cover
plate.
Proper care and handling must be observed to prevent damage
to
the
computer.
3
The Model 4P
is
100% compatible with all Model
III
and Model
4 disk software. System capability for Model III compatibility in-
cludes:
ZSOA
CPU, 2 MHz operation, programmable RAM to
emulate ROM
lor
BASIC operating system, memory-mapped
keyboard, memory-mapped video with 64-character by 16-line
display, and full
4SK
Random Access Memory (RAM). Model 4
compatibility includes:
ZSOA
CPU, 4 MHz operation, memory-
mapped keyboard
in
upper memory, memory-mapped video in
upper memory with SO-character by 24-line display, standard
64K
RAM
expandable to 12SK RAM. Other standard teatures
of the Model4P which were options on the Model
III
and Model
4 are built-in FDC Circuit with two
lS4K
Floppy Disk Drives and
an
RS-232-C Serial Communications Interface Circuit.
1.2 OPTIONAL FEATURES
Optional features available on the Model 4P include: 640 by
240 pixel High Resolution graphics Board, Direct-connect,
auto-dial, auto-answer 300 bps Modem Board. The Model 4P
does not support cassette operation
or
external Floppy Disk
Drive.
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