Digital Equipment LT19 Bedienungsanleitung

Digital

Equipment

Corporation

Maynard,

Massachusetts

PDP-15

Systems

Instruction

Manual

Volume

T19

Multi-Station

Teletype

Control

LT19

MUL

Tl-ST

TION

TELETYPE

CONTROL

INST-RUCTION

MANUAL

DEC-09-H2AB-D

DIGITAL EQUIPMENT CORPORATION

•MAYNARD,

MASSACHUSETTS

1st Printing

December

1968

2nd Printing May 1971

1968,

1971 by Digital Equipment

Corporation

The material in this manual

for informa-

tional purposes and

subject to

change

without notice.

The fol lowing

are

registered

trademarks

Digital

Equipment

Corporation,

Maynard,

Massachusetts:

DEC

FLIP

CHIP

DIGITAL

PDP

FOCAL

COMPUTER

LAB

CONTENTS

Page

CHAPTER-

GENERAL

DESCRIPTION

1.1 Introduction 1-1

1.2

Functional Description

1-2

1.3

LT19H

Data Communications

Cable

Option

1-4

1.4

Programming

1-5

1.4.1

LTl9B -

through 5) Device Selection Codes

1-5

1.4.2

Tl9

IOT Instruction Set

1-6

.4.3

Program Interrupts

1-7

1.5

Engineering Drawing References

1-7

1.6

Signal Mnemonics

1-7

CHAPTER

2 INSTALLATION

l Installation

2-1

2.2

Power Requirements 2-1

2.3

Interface

2-3

2.4

LT19E

Baud

Rate

Selection

2-4

2.5

Channel Assignments

2-5

2.6

InstaIlati

Checkout

2-7

.6.1

LT19D

Tests

2-7

2.6.2

LT19F

Tests

2-7

2.6.3

LT19H

Test

2-7

2.6.4

LT19H

System

Verification

2-8

CHAPTER

3 PRINCIPLES

OPERATION

3.1

Block Diagram Description

3-1

l •1 Transmit

Operation

3-3

3.1.2

Receive

Operation

3-4

3.2

Detailed

Transmit

Operation

3-5

3.3

Detailed

Receive

Operation

3-6

CHAPTER

4 MAINTENANCE

4.1

General

Maintenance

4-1

4.2

CIock Adjustments

4-1

4.3

Engineering Drawings

4-2

iii

ILLUSTRATIONS

Figure

No.

Title Page

1-1 L

T19

System, Typical Configuration 1..2

1-2

JOT

Instruction Format

1-5

2-1 Interface Connections

2-2

19-Devi

Interface Connections

2-3

3-1

LT19

Detailed Block Diagram

3-2

Transmit

Operation

Timing Diagram

3-5

3-3

Read

Operation

Timing Diagram

3-7

TABLES

Table

No.

Title Page

1-1 Differences Between Models

l-1

1-2

Related Documentation

1-3

Specification Summary

1-3

1-4

Device

Select

Codes

1-5

LT19

JOT

Instruction

1-6

2-1

Baud

Rate Selection

2-4

2-2

Channel Assignments for

One

LT19

2-5

2-3

Channel Assignments for

Two

LT19s

2-6

2-4

Channel Assignments for Three

LT19s

2-6

2-5

Channel Assignment for Fourth

LT19

2-7

4-1

Recommended Spare Modules

4-1

4-2

LT19

Multi-Station Teletype Control Drawing

Index List

4-2

CHAPTER 1

GENERAL DESCRIPTION

1.1 INTRODUCTION

This manual describes the

LT19

Multi-Station

Teletype Control used with both the PDP-9 and PDP-15

Programmed Data Processors manufactured by Digital Equipment

Corporation,

Maynard, Massachusetts.

The

LT19

Multi-Station

Teletype Control increases

the

basic

teletypewriter

facility

by permitting

data

transfers between

the

processor and

any

combination of up

five teletypewriters or

level-operated

data

terminal devices that

are

EIA-compatible*.

The

LT19

consists

three

logic subgroups: 1/0 bus interface logic; optional

Teletype®

control logic;

and optional EIA-level converter logic {refer

Table

1-1).

Initially,

this manual covered only the

and C versions of these logic subgroups. Because the D, E, and F versions

are

used with

the

PDP-15, portions of this manual

are

updated

cover

these models, where they

differ.

Logic Subgroup

Interface

Logic

Teletype Control Units

EIA-level converters

Table 1-1

Differences Between Models

PDP-9 PDP-15

LT19A LT19D

LT19B

LT19E

LT19C

LT19F

Differences

LT19D

includes wiring changes

permit separate transmit

clocks for

each

channel.

LT19E

has

additional

R401

Variable

Clock module for

the

separate

transmit

clock.

Identical

*Logic levels specified in Electronic Industries Association

(EIA)

Standard RS-232C "Interconnection

Data Terminal Equipment with a Communication

Channel".

®Teletype

is a registered trademark

Teletype Corporation.

1-1

Unless otherwise

indicated,

references in

text

or illustrations

LT19A,

or C type numbers

are

interchangeable with

their

corresponding LTl

90,

E, or E type numbers. Similarly, references

PDP-91/0

operations

are

valid for

the

PDP-15, as

well.

1.2

FUNCTIONAL DESCRIPTION

Figure 1-1 shows a typical

LT19

configuration utilizing three Teletypes and two

EIA

devices.

Under

program

control,

the

PDP-9 sends control signals,

device

select

signals, and parallel

data

words to the

LT19A

through

the

1/0

bus. The

LT19A

serves as an interface and control between

the

PDP-91/0

bus

and a specific L

T19B

or L

T19C

unit.

PDP-9

CONTROL

SIGNALS

PARALLEL

DATA

DEVICE

SELECT

SIGNALS

1---------------------,

LTl9

SYSTEM I

I I

SERIAL

DATA

SERIAL

DATA

SERIAL

DATA

EIA

SERIAL

DATA

____

TTY

EIA

DEVICE

* ANY COMBINATION

FIVE L

T19B

AND

LT19C

CONTROL UNITS MAY

USED

WITH THE

LT19A.

EIA I

s~~!1-

_ _

EIA

DEVICE

Figure 1-1 L

T19

System, Typical Configuration

Each

LT19B

includes

the

logic that comprises one Teletype control unit for operation with

ASR,

KSR,

RO, or SO Teletype

devices.

Under control of

the

LT19A, the

LT19B

converts parallel

data

words

from

the

PDP-9

serial information which can be

applied

the

Teletype

device.

a similar man-

ner,

the

T19B

receives serial information

from

a Teletype and converts it

parallel

data

which can

be transmitted

the

PDP-9.

The

LT19C

adds EIA-level converter

logic,

which permits

data

transfers between

the

PDP-9 computer

and a

device

using

EIA

levels.

Since the PDP-9

can

service a device in approximately 4

!JS

{one IOT instruction

time),

all

of the

slower operating devices

(TTY

and

EIA)

can operate simultaneously and

indicate

a servicing

require-

ment

the

PDP-9 via

the

Program Interrupt Enable

(PIE)

facility.

allow this type of operation,

each

device

assigned its

own

specific

device

code which enables

the

PDP-9

address

the

device

when servicing

required.

1-2

This manual contains operation and maintenance information for

the

LT19

Multi-Station Teletype

Con-

trol.

Maintenance and operation descriptions for the PDP-9

are

contained in

the

documents listed in

Table

1-2.

Title

PDP-9 User Handbook

PDP-15 User's Handbook

PDP-9 Maintenance

Manual,

Volumes I and

PDP-15 Maintenance Manual

Digital Logic Handbook

KF09A

Automatic Priority

Interrupt Instruction Manual

Technical manual for Model 32

and

33 ASR,

KSR,

and RO/SO

Teletype sets.

Parts list for Model

32,

and 33

ASR,

KSR,

and

Teletype

sets

LT19

Diagnostic PDP-9

PDP-15

LT19

Diagnostic

Characteristic

Character

code

Start code

*Standard Unit

Table

1-2

Related Documentation

Document Number

F-95

DEC-15-H2DC-D

F-97

DEC-15-H2BB-D

C-105

DEC-09-15AA-D

Teletype Bulletin

273B

Volumes I and

Teletype Bulletin

1184B

MAINDEC-09-D8CC

MAINDEC-15-D8CA

MAINDEC-09-D8CC-D

MAINDEC-15-D8CA-D

Table 1-3

Specification Summary

Description

Contains IOT instruction format

and program controlled transfer

considerations.

Provides maintenance techniques

and IOT device selection informa-

on.

Specifications and descriptions of

most

FLIP

CHIP modules, plus sim-

plified explanations for selecting

and using these modules in numer-

ous

applications.

Operation

and maintenance infor-

motion for

the

PDP-9 Automatic

Priority Interrupt

option.

Volume I contains

installation,

disassembly, reassembly,

lubrica-

tion and operation documentation.

Volume

includes adjustment

in-

formation on all component units

of these Teletypes.

Provides complete parts documen-

tation

for these Teletypes.

Fault isolating maintenance

pro-

gram.

Program description.

Specification

8-bit*

character

code

1 unit start code*

1-3

Table

1-3

(Cont)

Speci

tion. Summary

Characteristic Specification

Stop codes

Operation

Service

Speed

LT198

LT19E

1-,

1.5-,

or 2-units* stop code

Full

duplex

five units per

LT19A

or L

T19D

10,000

baud,

maximum. All units

operate

the

same

speed.

Variable

30,000

baud.

See

Note.

Transmission distance 2000

ft,

maximum. 20

Current

Loop

only -

110

baud.

Maximum length of

LT19H

is 250

feet.

Operating

temperature range

Operating

humidity range

Primary power requirements

55-122

°F

(15-50°C)

10-95%

115V, 60 Hz, 250W (approx.)

*Standard Unit

NOTE

The overall speed for

all

LT19E

channels is limited

30,000

baud,

for

all

N channels combined, where N = 1

16.

This limitation is imposed so

that

the

normal

proc-

essor service routines may handle

all

N channels simul-

taneously.

Assign the highest speed channels

the

first channels in

the system

keep

the

skip

chain

short.

a multiple

LT19D

System,

all

high-speed channels

must

first

prevent a low-speed channel

from

locking out a

high-

speed

unit.

1.3

LT19H

DATA

COMMUNICATIONS

CABLE

OPTION

The

LT19H

is a

data

communications

cable

option used for interprocessor buffer

applications.

It is used

between

LT19

and

PTOB,

between two LT19s, or between

the

LT19

and other devices with

equivalent

interface

and timing

characteristics.

The

cable

available

in five lengths:

Option

Length

(ft.)

LT19HA

LT19HB

100

LT19HC

150

LT19HD

200

LT19HE

250

1-4

PROGRAMMING

Communication between the PDP-9 or PDP-15 and

the

LT19

units

accomplished by IOT instructions.

The keyboard and teleprinter circuits of a Teletype

are

considered independent

devices.

Therefore

each

circuit

assigned a different

device

code

control its operation. The first Teletype has a

de-

vice

code of 400X assigned to its

teleprinter

circuit

and a device code of 410X assigned

its keyboard

(or

paper-tape

reader)

circuit.

The

LT19

employs the IOT instruction format discussed in the PDP-9 and PDP-15 User Handbook. The

format example in Figure 1-2 shows

the

bit assignments.

OPE

RAT

CODE

DSO-DS5

CLEAR

IOPZ

o 1J2131415

sJ1

sl9l10l11l12J13l14l15l1sl11J

'---y---.J

'---v---1

'-yJ

UNUSED

SDO-SD1

IOP1

IOP4

Figure 1-2 IOT Instruction Format

The main components of the IOT instruction

are

as follows; four operation code

bits,

six

device

selec-

tion bits

(DSO

through DS5), two subdevice selection bits

(SDO

and

SDl),

and three IOP bits

(IOPl,

and

4).

all

IOT instructions the operation code

708. The device selection bits identify the

de-

vice

selected and the type of operation

be performed. The subdevice selection bits identify

these-

lected

circuit

within

the

LT19

and the IOP pulses

initiate

the

required function within the selected

circuit.

A 1 in bit

clears

the

processor accumulator prior

an input data transfer.

Bits

4 and 5

are

not used.

1.4.1

LT19B

through 5) Device Selection Codes

The IOT format for the first five

LT19B

units

shown in Table

1-4.

The specific device

select

coding

for

each

control unit is underlined. Channel assignments for systems with more than one

LT19

unit

are

described in Paragraph 2

of Chapter

Installation.

Unit

LT19B-1

LT19B-2

Table

1-4

Device

Select

Codes

Transmitter Code

(Teleprinter)

70400X

70402X

1-5

Receiver Code

(Keyboard)

70410Y

70412Y

-(continued on next page)

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