Table of Contents
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INTRODUCTION
(cont.)
4023
Users
Data
Processing
System
(cont.)
Data
entered
from
the
keyboard can
be routed
directly
through
the
Terminal
Control
circuits,
the
Interface,
and
thence
to the
computer,
by-passing the
Terminal
memory.
If
a
data
"echo"
exists,
the data
is
processed
by
the
Terminal
circuits
and
displayed.
Data
is
not always
sent
directly
to
the
computer from
the keyboard.
Keyboard
data
can be
first
stored
in
the
Terminal
memory,
edited,
then transmitted to the computer.
When
a
Make Copy
command
is
given
by any
source (computer.
Terminal, or
at
the
Hard
Copy
Unit),
the
Hard
Copy
Unit
takes control of
the Terminal,
extracts
the
display
information,
and reproduces
the
display
on
paper.
Operating
Modes
You
will
normally operate
the
Terminal
"on
line"
with the computer,
as
selected
by
the
LOCAL/ON
LINE
switch
(this
switch can be placed
in
the
LOCAL
position for
operator
training,
using the
Terminal with
auxiliary
devices
independent
of the
computer,
repair,
etc.).
The
basic
On
Line
operations
are
Transmitting
and
Receiving.
An
introduction
to
these
operations
is
given
in
the remainder
of
this
section,
along with
a brief
description of Local
and Hard
Copy
Operation.
1-4
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