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1-1 SCOPE
SECTION 1
INTRODUCTION
DIDS-40Z-ZMlO
Para
l-l/l-Z.l~
This manual contains information needed to install and align the DIDS*-400
Display Terminal, Model 402-2MlO (figure 1-1).
See table 1-1 for a listing of
other standard displays.
Table 1-1.
DIDS-400 Standard Display Terminals
Control Unit
Characters
Model
Reqd
Coding
Displayed
401-2
Yes
ASCII
520
401-2A
Yes
ASCII
1040
402-1
No
BCD
520
402-2
No
ASCII
520
402-2A
No
ASCII
1040
1-2.
PURPOSE AND USE OF EQUIPMENT
The purpose of the 402-2MlO Display Terminal is to provide quick-
response, on-line communication with a digital computer.
The unit consists
of a display and keyboard with a self-contained interface to permit direct con-
nection to either the Bell System 202 C/D modem, the Western Union 2121
modem, or its equivalent.
1-2. 1 Technical Characteristics
a.
The Model 402-2MI0 Display Terminal can display 520 characters
on
its
cathode ray tube (CRT) screen which has a viewing surface
of 6-1/2 inches by 8-1/2 inches.
The format consists of
13
lines
with 40 characters on each line.
The character size is approxi-
mately
o.
17 inch high by
O.
14 inch wide.
The high-quality con-
tinuous-type characters greatly reduce operator fatigue, and the
bright flicker-free presentation can be viewed easily in normal room
lighting.
Each Display Terminal contains its own buffer memory.
character generation, interface logic, and timing circuits.
b.
Data transfer to and from the Display Terminal takes place at a
nominal rate of 120 characters / second.
c.
Solid-state integrated circuitry provides high reliability. reduced
power consumption, and compactness.
All composing and editing
is accomplished off-line - that is. the system is connected to the
computer only during transmission of information •
• A
TRADEMARK OF RAYTHEON COMPANY
1-1
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