VISUAL
TECHNOLOGY
INCORPORATED,
540
MAIN
STREET,
TEWKSBURY,
MA
01876
2.
SPECIFICATIONS/CHARACTERISTICS
The
VISUAL
100 display terminal consists
of
three basic subassemblies: Keyboard, Video
Monitor,
and Printer
Circuit
Board including communication interface. The following paragraphs summarize
the basic features
of
each
subassembly. Section 2.4 lists the general specifications
of
the
VISUAL
100. '
2.1
KEYBOARD
The
VISUAL
100 employs a field proven solid-state keyboard using capacitively coupled
keys
for
high reliability and long life. The keys
are
arranged in a familiar
"typewriter"
layout
as
pictured in Figure 4-1.
The keyboard
is
fully
detachable
from
the
terminal
for
operator
comfort
and optimal
space
utilization. The cable leading
from
the keyboard
is
terminated
with
a 15-pin connector
which plugs
into
the receptacle labeled keyboard on the rear panel.
Depressing a key on the keyboard
will
cause
its code
to
be
sent
out
on the communication
interface provided the terminal
is
online.
1
All
keys except those noted in Section 3.2.2. 7
may also
be
defined
to
be
"typomatic",
(auto repeat) or non-typomatic. The
typomatic
feature allows the codes
for
the depressed key
to
be
generated at a rate
of
30
characters
per second.
Section 4 details all keys on the keyboard and the code(s) they generate.
2.2
VIDEO
MONITOR
AND
COMPOSITE
VIDEO
The Video
Monitor
used
in the
VISUAL
100
is
a high
quality
12"
cathode ray tube (CRT).
The CRT
uses
a
P4
white phosphor and a non-interlaced raster scanning method
to
produce
crisp,
easy
to
read
characters
of
high resolution. The CRT includes a non-glare faceplate
to
assure
easy
readability
even
in the brightest environments. Characters
are
formed using 7x7
dot
matrix
for
upper
case,
and
7x9
for
lower
case.
The format
for
character display may
be
either 24 lines
of
80 characters or 24 lines
of
132
characters. Characters may also
be
formed in double heights and double widths on a line
by
line
basis.
Composite video
output
is
provided via a jack on the rear panel. This feature
will
drive
another T. V.
monitor
of
the following specifications:
1.
Video Bandwidth 12 MHz
2.
Horizontal Frequency 15.6 kHz
3. Voltage
Output
1.5 Volts,
Peak
to
Peak
2.3 P.C.B.
AND
COMMUNICATION
INTERFACE
A single, vertically mounted printed
circuit
board (P.C.B.) contains all
necessary
program
memory (ROM) and display memory (RAM). The P.C.B. utilizes a convection cooled,
no-fan design
for
high reliability and silent operation.
1
some
keys do
not
produce codes when depressed alone. See Section 4.
3
To Next Page
Loading...