Introduction; Section I; Functional Operation; Description Of Section Contents - Raytheon DIDS-400 Series Technical Manual

DIDS-402-2AMl3
CHAPTER 4
THEORY OF OPERATIGN
4-1 INTRODUCTION
This chapter presents the theory of operation for the Raytheon Model
402-2AM13 Display Terminal hereinafter referred to as the Display Terminal.
Explanations begin with system application and become increasingly technical as
the chapter progresses. For convenience, this information is divided into four
sections, which contain the following information: Section I, Functional Operation,
a system description of the Display Terminal including explanations concerning
conversational modes, message formats, and data handling capabilities; Section II,
Functional De scription, a de scription of each major circuit on a block diagram
basis; Section III, Circuit De scription, an explanation of the circuits contained
on each analog and digital circuit board; Section IV, Integrated Circuits, a
description of the operation of the various integrated-circuit logic elements used
on the various circuit boards.
SECTION I
FUNCTIONAL OPERATION
4-2 DESCRIPTION OF SECTION CONTENTS
This section contains several detailed explanations pertaining to the basic
operation and design features of the Display Terminal. These explanations
document system description, system operation, optional design features,
conversational modes, and message formats.
4-3 SYSTEM DESCRIPTION
The Display Terminal is specifically de signed to provide keyboard input
and visual access to information stored or processed by a central computer.
The Display Terminal is entirely self-contained and requires no auxiliary equip-
ment for operation other than a suitable Central Proce s sing Unit Input/ Output
(CPU I/O) device (part of the CPU). From 1 to 64 Display Terminals can be
connected to the CPU depending upon the requirements of the system. Figure 4-1
illustrates two basic system configurations employing the Display Terminal.
Part A of figure 4-1 illustrates a system where only one Display Terminal is
connected to the CPU; Part B, a system where several Display Terminals are
connected to the CPU via a multiplexer. The multiplexer portion of the IIO
controller selects one of the several Display Terminals, either sequentially or
randomly.
4-1