Digital Equipment DF32 Manuale utente

INSTRUCTION MANUAL

DISK FILE

AND

CONTROL

DIGITAL EQUIPMENT CORPORATION •MAYNARD, MASSACHUSETTS

DEC-D8-IDFA-D

DISK FILE AND CONTROL

INSTRUCTION MANUAL

DIGITAL EQUIPMENT CORPORATION •MAYNARD. MASSACHUSETTS

1st Printing March 1968

2nd Printing October 1968

3rd Printing November 1968

Inslruction 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 are registered trademarks of Digital

Equipment Corporation, Maynard, Massachusetts:

DEC PDP

FLIP CHIP FOCAL

DIGITAL COMPUTER LAB

CONTENTS

CHAPTER 1

INTRODUCTION

Page

1.1 Purpose and Scope 1-1

1.2 Reference Documents and Programs 1-2

1.2.1 Manuals 1-2

1.2.2 Operation and Maintenance Programs 1-2

1.3 System Specifications 1-3

1.4 Physical Description 1-4

1.4.1 Disk File Assembly 1-5

CHAPTER 2

OPERATION AND PROGRAMMING

2-2

2-7

2-8

CHAPTER 3

PRINCIPLES OF OPERATION

3.1 Disk Format 3-1

3.2 NRZI Recording 3-2

3.3 General Operation of Search, Read, and Write 3-2

3.4 Timing Pulses 3-5

3.5 Detailed Logic Discussion 3-5

3.5.1 Address Searching 3-8

2.1 Operating Controls

2.2 IOT Instructions

2.3 Interrupt Flags

2.4 Error Flags

2.4.1 DRL Flag

2.4.2 PER Flag

2.4.3 WIA Flag

2.4.4 WIB Flag

2.4.5 EWL Flag

2.5 ADC Flag

2.6 Status Evaluation

2.7 Programming Example

CONTENTS (Cont)

Page

3.5.2 Read 3-10

3.5.3 Write 3-11

3.5.4 Track Head Selection 3-12

3.5.5 Continuous Data Transfers 3-12

3.5.6 Disk Expander Operation 3-12

3.5.7 Errors 3-13

3.5.8 Timing Track Writer 3-13

3.6 Special Circuits 3-16

3.6.1 G083 Differential Preamplifier 3-16

3.6.2 G284 Disk Writer 3-17

3.6.3 G285 Series Selector Switch 3-17

3.6.4 G286 Center Tap Selector 3-18

3.6.5 G702 Disk Simulator 3-19

3.6.6 54-4073 Photocell Amplifier 3-20

3.6.7 G680 Disk Head and Matrix 3-20

CHAPTER 4

INSTALLATION

4.1 Power and Cable Requirements 4-1

4.2 Mounting Suggestions 4-2

CHAPTER 5

MAINTENANCE

5.1 Disk/Head Cleaning Procedure 5-1

5.1 .1 Disk Removal 5-1

5.2 Troubleshooting 5-3

5.3 Disk Operating Procedure for Timing Track Writer DF32 5-7

ILLUSTRATIONS

1-1 DF32 System Block Diagram 1-1

1-2 DF32 Unit, Rack Mounted on Slide 1-4

1-3 Disk File Assembly 1-5

1-4 Disk File Assembly, Read/Write Head Locations 1-6

ILLUSTRATIONS (Cont)

Page

2-1 DF32 Operating Control Panels 2-3

2-2 DS32 Operating Control Panel 2-3

3-1 Simplified Diagram of NRZI Recording 3-3

3-2 Simplified Diagram of Read and Write 3-4

3-3 Timing Diagram 3-10

3-4 Block Diagram, G083 Differential Preamplifier Module 3-16

3-5 Block Diagram, G284 Disk Writer Module 3-17

3-6 Block Diagram, G285 Series Selector Switch Module 3-18

3-7 Block Diagram, G286 Center Tap Selector Module 3-19

3-8 Block Diagram, G702 Disk Simulator Module 3-20

3-9 Block Diagram, G680 Disk Head and Matrix Module 3-21

4-1 Mounting Dimensions 4-2

4-2 PDP-8, PDP-8/S, PDP-8/I Cabling 4-3

5-1 Disk Removal 5-2

5-2 Head Cleaning 5-2

5-3 Timing Diagram for DF32 Disk Timing Track Writer 5-9

TABLES

1-1 Reference Documents 1-2

1-2 Operation and Maintenance Programs 1-3

1-3 Disk File System Specifications 1-3

2-1 DF32 Logic Rack Controls 2-2

2-2 DS32 Logic Rack Controls 2-2

2-3 IOT Instructions 2-4

2-4 IOT Instruction Analysis 2-5

3-1 Mnemonic Codes for DF32 Disk System 3-5

3-2 Mnemonic Codes for DF32 DECdisk Timing Track Writer 3-14

Typical PDP-8/S and Disk File Installation

CHAPTER 1

INTRODUCTION

The Type DF32 Disk File and Control, manufactured by Digital Equipment Corporation,

Maynard, Massachusetts Is afast, random or sequential access, bulk storage device used with the

PDP-8, PDP-8/S, or PDP-8/I computers for memory expansion. The DF32 provides acapacity of 32,768

13-bit words which are stored on arotating disk.

Up to three type DS32 Extender. Disks can be attached to the DF32, each of which extends

the bit capacity by 32K for atotal of 131 ,072 13-bit words as shown in Figure 1-1 .

The disk file is aprogram controlled device used in conjunction with the PDP-8, PDP-8/S,

or PDP-8/1, and operates through the 3-cycle data break facility of the computers.

1.1 PURPOSE AND SCOPE

This manual and the referenced documents herein provides operation, programming, and

maintenance information on both the Type DF32 Disk File and Control and DS32 Extender Disk. The

programming information, which includes sample programs for storage access, is presented in sufficient

detail to allow operating programs to be written. Although references throughout this manual are

primarily made to the PDP-8 computer, the information may be assumed to apply equally to the PDP-8/t

and PDP-8/S except where specifically noted otherwise.

PDP-8, 8/1 DF32 DISC

OR PDP-8/S CONTROL 32K

1r''''

DS32 DS32 DS32

1<1111

OISC

32K DISC

32K

Figure 1-1 DF32 System Block Diagram

1-1

The information in this manual is intended for use by persons familiar with DEC digital logic

and the operation of the PDP-8, PDP-8/S, and PDP-8/1 computers. The maintenance information and

routines require knowledge of the operation of bulk storage devices.

1.2 REFERENCE DOCUMENTS AND PROGRAMS

1.2.1 Manuals

Table 1-1 is alisting of the available publications which augment the information contained

in this manual. These publications may be obtained upon request from the nearest DEC office or from

the following address:

Digital Equipment Corporation

Main Street

Maynard, Massachusetts

Table 1-1

Reference Documents

Document Description

Digital Logic Handbook (CI 05)

PDP-8 Maintenance Manual (F87)

PDP-8/S Maintenance Manual

(F87S)

PDP-8/1 Maintenance Manual

Small Computer Handbook (C500)

Function and specifications of FLIP-CHIP

modules, cabinets, power supplies and

accessories.

Theory, operation, and maintenance

information on the PDP-8 Processor.

Theory, operation, and maintenance

information on the PDP-8/S Processor.

Theory, operation, and malntenace

information on PDP-8/1 Processor.

Describes operation and programming of

PDP-8 and PDP-8/S computers.

1.2.2 Operation and Maintenance Programs

Table 1-2 lists the operating and maintenance programs available for the DF32 and DS32

systems

1-2

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