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DEC-08-I2AB-D

December 1969

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Document:	dec-08-i2ab-d
Order Number:	DEC-08-I2AB-D
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Pages:	123
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OCR Text

INSTRUCTION MANUAL

DECTAPE CONTROL UNIT
TYPE TC01

DIGITAL EQUIPMENT CORPORATION • MAYNARD, MASSACHUSETTS

DEC-08-I3AB-D

DECTAPE CONTROL UNIT
TYPE TC01
INSTRUCTION MANUAL
April 7968

DIGITAL EQUIPMENT CORPORATION • MAYNARD, MASSACHUSETTS

1st

Printing September 1968

2nd Printing (Rev) April 1968
3rd Printing March 1969

4th Printing July 1969

InstrucHon times, operating speeds and the like are in-

cluded In this manual for reference only; they are not to
be taken as specifications.

The following ore registered trademarks of Digital
Equipment Corporation, Maynard, Massachusetts:

DEC

PDP

FLIP CHIP

FOCAL
COMPUTER LAB

DIGITAL

CONTENTS
CHAPTER

INTRODUCTION
1

General Description

1-1

Referenced Documents

1-2

Physical Description

1-2

.3.1

Equipment Characteristics

1-3

.3.2

Electrical Requirements

1-5

^
LI A DTCD O
CHArl
cK z
OPERATION AND PROGRAMMING
0
A

UtCtape rormat

2-1

Z.I.I

Mark-Track Format

2-3

Z.Z

DbCtape Instructions

2-6

btatus Register A Functions

2-7

o
o o
z.z.z

Status Register B Functions

2-8

z.o

Control Modes and Functions

2-10

Z .*f

Control Functions

2-10

iViove

z- 0

1
.

z.z.

Z ^.
.

o in
z-

? 4 ?

r\eaa uara

2-1

2 4 4

R^nH All

9 1
Z-

9 4

vvrire

9 4 6

uara

1
1

2-1

WritP
All
V V lie rtl

Write Timing and Mark Tracks

2-1

Enable to the Interrupt

O 11
2-1

Programmed Operation

O 1O
2-13

2.5.1

Simplitied Search Procedure

2-15

2.5.2

Bootstrap Loading

2-16

2.5.3

Upper Bound Protection for Data Transfer

2-16

2.5.4

Write/Read in Opposite Direction

2-16

2.5.5

Turn Around Specifications

2-16

2.6

Available Software

2-17

2.6.1

Subroutines

2-17

2.6.2

Library Calling System

2-18

9 4
^.7
/
Z
.

9 4

9
Z 0
.

OCT

iii

CONTENTS (continued)
2.6.3

Performatting Tape Programs

2.6.4

Maintenance Programs

2.7

Symbols and Abbreviations

2-18
O 1Q
O
L1

i- 7
1

CHAPTER 3
PRINCIPLES OF OPERATION
3-1

3.1

Functional Description

3.1 .1

Information Flow

3.1 .2

Command Flow Registers

3.2

Detailed Logic Operations

3.2.1

Basic Read/Write Logic

3.2.2

Read and Write Amplifiers

3.2.3

Device Selector Logic

3.2.3.1

STATUS A Decoding

3.2.4

Status Register B and Skip Instructions

3.2.5

Unit Select Logic

3.2.6

Motion Control

3.2.7

Function Selection

3.2.8

Interrupt Enable

3.2.9

New Unit/Motion Select

3.2.10

Timing Pulse Generation

3.2.11

Counter Register (C)

3.2.12

Window Register (W)
Counter Synch Level (C-SYNC)

3-23

3.2.12.1

3.2.12.2

Start Block Marks

(MK BLK MK)

3-23

3.2.12.3

Data Marks

3.2.13

State Register

3.2.14

Memory Field Register (MF)

3.2.15

Function Operq^tions

3.2.15.1

Move Tape

3.2.15.2

3.2.15.3

Read Data

3.2.15.4

Read All Function

3.2.15.5

Write Data Function

3.2.15.6

Write All Function

3-1

3-4

3-10
3-12
3-12

3-12
3-13
3-14

3-15
3-15
3-15

3-15
3-16

3-17

3-24
3-25

3-27
3-27
3-27
3-28
3-28

3-29
3-30
3-31

CONTENTS (continued
3.2.15.7

Write Timing and Mark-Track

3.2.16

Read and Write Sequences

3.2.16.1

Read/Write Control Signals

3.2.17

Longitudinal Parity Buffer Operation

3.2.17.1

LPB Control Signals

3.2.18

Power Clear and Error Stop Logic

3.2.19

Increment CA Inhibit (+1

3.2.20

Address Accepted

3.2.21

Transfer Direction

3.2.22

B RUN Level

3.2.23

Fixed Address

3.2.24

Interrupt Request

3.2.25

ERROR FLAGS (EF)

3.2.25.1

Mark-Track Error (MK TRK)

3.2.25.2

Select Error (SE)

3.2.25.3

Parity Error (PAR)

3.2.25.4

Timing Error (TIM)

3.2.25.5

End Error (END)

3.2.26

DECtape Flag (DTF)

3.2.27

Panel Indicator Drivers

CA INH)

CHAPTER 4
INSTALLATION
4.1

Installation Procedures

4.1 .1

Site Preparation

4.1 .2

Environmental Conditions

4.1.3

Power and Cable Requirements

4.1 .4

DECtape Signal Connectors

CHAPTER 5

MAINTENANCE
5.1

Maintenance Equipment

5.2

Maintenance Control Panel

5.3

DEC Modules

5.3.1

Module Locations and Complement

CONTENTS (continued)
5.3.2

Circuit Descriptions

5-5

5.3.3

Module Replacement Procedure

5-18

5.4

Power Supply 779

5-18

5.4.1

Mechanical Characteristics

5-19

5.4.2

Power Supply Checks

5-19

5.4.3

Marginal Checks

5-20

5.5

Power Control Panel (Type 834)

5-21

5.6

Preventive Maintenance

5-22

5.6.1

Mechanical Checks

5-22

CHAPTER 6

ENGINEERING DRAWINGS
6.1

Symbols and Designations

6-1

6.2

Drawing List

6-1

ILLUSTRATIONS
1- 1

TCOl System Configuration

1-1

DECtape Track Allocation

2-1

2-2

DECtape Control and Data Word Assignments

2-2

2-3

DECtape Recording Format

2-3

2-4

DECtape Mark Track Format

2-4

2-5

Status Register A, Format

2-7

2-6

Status Register B, Format

2-8

2- 7

Turn Around Sequence Diagram

2-17

Type TCOl DECtape Control Functional Block Diagram

3-2