Ibm System/370 145 User manual

Systems

GC20-1734-2

A Guide to the

IBM

System/370

Model 145

This guide presents hardware, programming systems,

and other pertinent information about the

IBM

Sys-

tem/370 Model 145 that describes its significant new

features and advantages. The contents are intended

to acquaint the reader with the Model 145 and

to

be

of benefit in planning for its installation.

Associated with this guide are four optional supple-

ments that describe operating systems for the

Model 145 that support a virtual storage environment.

Each supplement has its own form number and must

be

ordered individually,

if

required. Optional supple-

ments are the following:

• DOS/Virtual Storage Features Supplement*

•

as/Virtual

Storage 1 Features Supplement

(GC20-1752)

•

as/Virtual

Storage 2 Features Supplement

(GC20-1753)

• Virtual Machine Facility/370 Features Supplement*

*Availability to be announced

Third Edition (August 1972)

This

is

a major revision obsoleting GC20-1734-1. Text has been added or changed to in-

clude information about the following: EC mode; dynamic address translation; channel

indirect data addressing; program event recording;

CPU

timer and clock comparator; new

System/370 instructions; store status facility; integrated storage control for 3330-series

disk storage; 3830 Storage Control Model 2; virtual storage concepts, advantages,

terminology, and performance factors; DOS/VS, OS/VS1, and OS/VS2 support

of

Model 145 hardware features;

DOS

Version 4 support; and miscellaneous additions and

corrections. Changes to the

text

and illustrations are denoted by the vertical line to the

left

of

the change. In addition, this publication

is

now structured as a base publication

for which optional programming systems supplements describing virtual storage operating

systems can be ordered.

This guide

is

intended for planning purposes only.

It

will be updated from time to time;

however, the reader should remember

that

the authoritative sources

of

system informa-

tion are the system library publications for the Model 145, its associated components and

its programming support. These pUblications will first reflect any changes.

Requests for copies

of

IBM

publications should be made to your

IBM

representative or to

the

IBM

branch office serving your locality.

A form has been provided

at

the back

of

this publication for readers' comments.

If

this

form has been removed, address comments to:

IBM

Corporation, Technical Publications

Department, 1133 Westchester Avenue, White Plains, New York 10604. Comments become

the property

of

IBM.

PREFACE

It

is

assumed

that

the

reader

of

this

publication

is

familiar

with

System/360.

The

reader

should

have

a

general

knowledge

of

System/360

architecture,

channels,

I/O

devices,

and

programming

systems

support.

This

guide

highlights

only

those

Model

145

hardware,

I/O,

and

programming

systems

features

that:

are

different

from

those

of

system/360

models

and

discusses

their

significance.

This

publication

applies

to

systems

with

60-cycle

power.

The

total

Model

145

guide

consists

of

this

base

publication

(Sections

01

to

70),

which

covers

virtual

storage

concepts

and

Model

145

hardware

and

I/O

devices,

and

from

one

to

four

optional

supplements

(Sections

80

to

110).

The

optional

supplement:s

describe

the

facilities

of

the

IBM

operating

systems

that

support

a

virtual

storage

environment

using

the

dynamic

address

translation

hard~rare

of

the

Model

145.

Each

optional

supplement

has

its

own

unique

form

number

and

each

supplement

desired

must

be

ordered

separately

and

inserted

in

this

base

publication,

which

is

distributed

without

the

automclltic

inclusion

of

any

optional

supplements.

The

following

optional

supplements

can

be

inserted

in

this

base

publication:

•

DOS/Virtual

Storage

Features

Supplement*

-

assumes

knowledge

of

DOS

Version

4

•

as/Virtual

Storage

1

Features:

Supplement

(GC20-1752)

-

assumes

knowledge

of

as

MFT

•

as/Virtual

Storage

2

Features:

Supplement

(GC20-1753)

-

assumes

knowledge

of

OS

MVT

•

Virtual

Machine

Facility/370

Features

Supplement*

All

optional

supplements

also

assume

knowledge

of

virtual

storage,

dynamic

address

translation,

and

other

new

Model

145

features

as

described

in

this

base

publication

or

appropriate

system

library

manuals.

However,

no

optional

sUlpplement

requires

knowledge

of

the

contents

of

any

other

optional

su.pplement.

This

base

publication,

as

well

as

each

optional

supplement,

begins

with

page

1

and

includes

its

own

table

of

contents

and

index.

The

base

publication

or

supplement

title

is

printed

at

the

bottom

of

each

page

as

a

means

of

identification.

*Availability

to

be

announced

A

Guide

to

the

IBM

System/370

Model

145

The

optional

programming

systems

supplements

contain

System/370

model-independent

information.

unless

otherwise

noted,

and

are

designed

to

be

included

in

the

guides

for

System/370

Models

135,

145,

158,

and

168

as

shown

below.

Supplements

DOS/VS OS/VS1

OS/VS2

VM/370

Features

Features Features

Features

Base

Supplement

Supplement Supplement

Publications

(*>

(GC20-1752)

(CGC20-1753)

(*)

A

Guide

to

the

IBM

System/370

Model

135

X X X

(GC20-1738-4

or

later

editions)

A

Guide

to

the

IBM

system/370

Model

145

X X X X

(GC20-1734-2

or

later

editions)

A

Guide

to

the

IBM

System/370

Model

158

X X X X

(GC20-1754)

A

Guide

to

the

IBM

System/370

Model

168

X X X

(GC20-1755)

Additional,

more

detailed

information

regarding

System/370

Model

145

hardware

and

programming

systems

support

can

be

found

in

system

library

publications.

*Availability

to

be

announced

A

Guide

to

the

IBM

System/370

Model

145

CONTENTS

Base

Publication

sections

(01

to

10)

section

01:

System

Highlights

••

Section

10:

Architecture

Design.

System

Technology,

and

System

Components

• • • • •

10:05

Architecture

Design

and

system

Technology.

Architecture

Design.

system

Technology.

a • • • •

Major

Components

• • • • • •

10:10

The

Central

Processing

Unit

(CPU)

•••

Control

Registers.

•

Basic

Control

Mode •

Extended

Control

Mode.

•

Expanded

Instruction

Get

Byte-Oriented

Operands

•

Monitoring

Feature

• • •

Architecture

Implementation

Alterations.

• • • • •

Interval

Timer

• • • • • • • • •

Time

of

Day

Clock.

• • • • • • •

Clock

Comparator

and

CPU

Timer

•

10:15

storage

and

the

Console

File.

10:20

10:25

10:30

10:35

Control

and

Processor

(Main)

Storage

•

The

Console

File

• • • •

Channels

• • • • • • • • •

Byte

Mul

t.iplexer

Channel

Integrated

File

Adapter.

Selector

Channels.

• • •

Block

Multiplexer

Channels

• .

..

Block

Multiplexing

Operations

with

Rotational

Position

Sensing

Devices.

• • • • • • • • • • • • • • • • • •

summary

of

Block

Multiplexing

Operations

with

I/O

Devices.

• • • • • • • • • • • • • • • • • • • • •

system

Control

Panel

and

System

Console

••

System

Control

Panel

•

••

• • •

System

Console

• • • • • • • • • •

standard

and

Optional

System

Features.

•

Standard

Features.

• • • • •

Optional

Features.

• • • • • • • • •

Section

15:

Virtual

Storage

and.

Dynamic

Address

Translation.

15:

05

Virtual

Storage

Concept.s.

Advantages,

and

Terminology.

The

Need

for

Larger

A.ddress

Space.

• • • • •

'.

• •

Virtual

storage

and

Dynamic

Address

Translation

1

9

10

13

14

15

20

21

22

23

24

21

29

30

31

32

31

40

41

41,

42

43

44

Concepts

• • • • • • • • •

..

• • • • •

.•

• •

...

• •

48

General

Advantages

Of'fered

by

IBM

Operating

Systems

that

Support

a

Virtual

Storage

Environment

• • • •

54

Virtual

Storage

and

Dynamic

Address

Translation

Terminology.

• • • • • • • • • •

'.

•

••

• • • • • • 61

15:10

Dynamic

Address

Translation

Facility

for

the

Model

145

66

Virtual

Storage

Organ.ization

• • • • • • • • • • •

66

Operation

of

Dynamic

Address

Translation

Hardware.

61

Features

to

Support

Demand

Paging.

• • • • • • • •

14

Channel

Indirect

Data

Addressing

• •

••

• • • • •

16

15:15

system

Performance

in

a

Virtual

storage

Environment.

18

System

Resources

Required

to

Support

a

Virtual

Storage

Environment.

• • • • • • • • • • • • • • •

19

New

Factors

that

Affe!ct

System

Performance

•

.•

•

'.

82

Relationship

Between

Virtual

Storage

Size

and

System

Performance.

• • • • • • • • • • • • • • • • • • • •

••

85

A

Guide

to

the

IBM

System/370

Model

145

Increasing

system

Performance

in

a

Virtual

Storage

Environment.

• • • • • •

89

section

20:

I/O

Devices.

•

94

20:

05

I/O

Device

Support.

'.

• • •

94

20:10

3330-Series

Disk

Storage.

• • • •

95

3330

Disk

storage

and

3333

Disk

Storage

and

Control.

'..

95

3830

Storage

Control

• • • • • • • • • •

'..

97

Integrated

Storage

Control

• • • • • • • •

101

summary.

• • • • • • • • • •

.•

• • '. • • • 1

03

20:15

The

2305

Fixed

Head

Storage

Module

and

2835

Storage

20:20

20:25

20:27

20:30

Control

Model

2.

• • • • • • • • • • • • • •

Data

Recording

• • • • • • •

••

.

Rotational

Position

Sensing

and

Multiple

Requesting

••

The

3211

Printer

•••••••••••

The

3803/3420

Magnetic

Tape

subsystem.

The

3410/3411

Magnetic

Tape

subsystem.

The

3505

Card

Reader

and

the

3525

Card

Punch

•

The

3505

Card

Reader

• • • • • • • •

The

3525

Card

Punch

• • • • • • • •

Error

Recovery

Procedures

for

the

3505

and

3525

Maintenance

••••

summary

• • • • • • • • •

103

•

105

108

110

121

•

128

131

135

•

138

140

142

Section

30:

Programming

Systems

Support

of

the

Model

145

in

BC

Mode.

• • • • • • • • • • •

30:05

Trends

in

Data

Processing

and

Programming

Systems

••

30:10

OS

MFT

and

MVT

Support

••

30:15

DOS

Version

4

Support

••••••••••

Section

40:

Emulators.......

• • • • • •

••

40:05

OS

1410/7010

and

1401/1440/1460

Emulator

Programs.

'.

Features

Common

to

Both

Emulators.

• •

OS

1410/7010

Emulator

Program

Support.

..

• •

•••

OS

1401/1440/1460

Emulator

Program

Support

••••

40:10

DOS

1401/1440/1460

and

1410/7010

Emulator

Programs

•

Features

Common

to

Both

Emulators.

• • • • • •

DOS

1401/1440/1460

Emulator

support.

• • •

••

OOS

1410/7010

Emulator

Support

••••

'

••••

40:

15

OS

DOS

Emulator

Program.

• • • • • • • • • • •

'.

Emulator

Job

Submission

and

General

Operation.

I/O

Device

Staging

and

Sharing

• • • • • • • •

Installation

of

the

OS

DOS

Emulator.

• • • • • • •

Section

50:

Reliability,

Availability,

and

Serviceability

(RAS)

145

•

146

152

158

163

166

169

172

175

177

•

179

180

•

182

Features

• • • • • • • • •

185

50:05

Introduction...

• • • • • • • • • • •

185

50:10

Recovery

Features.

• • • • • •

186

Automatic

Microinstruction

Retry

• • • •

186

ECC

Validity

Checking

on

Processor

and

Control

Storage

•

187

I/O

Operation

Retry.

• • • • • • •

189

Expanded

Machine

Check

Facilities.

• • • • • • • • •

190

Machine

Checks

on

System/360

Models

30

and

40.

•

196

Recovery

Management

Support

(RMS)

for

OS

MFT

and

MVT

• •

196

Error

Recovery

Procedures

(ERP's)

for

OS

• • •

199

statis,tical

Data

Recorder

(SDR)

and

Outboard

Recorder

(OBR)

for

OS.

• • • • • • • • •

199

Environment

Recording,

Edit,

and

Print

Program

(EREP)

for

OS

• • • • • • • • • • • • • • •

I/O

RMS

for

OS

• • • • • • • • • • • • • • • •

Advanced

Checkpoint/Restart

and

Warm

Start

Facilities

199

for

OS

• • • • • • • • • • • • • • • • • • • • •

••

200

Recovery

Management

Support

(RMS)

for

DOS

Version

4.

• •

201

Error

Recovery

Procedures

(ERP's)

for

DOS

Version

4

•••

203

A

Guide

to

the

IBM

System/370

Model

145

50:

15

50:20

Recovery

Management

Support

Recorder

(RMSR)

for

DOS

Version

4.

• • • • • • • • •

•••

'.

• •

204

Environment

Recording',

Edit,

and

Print

program

(EREP)

f

or

DOS

Versions

3

and

4 • • • • • • • • • •

'.

• • •

204

Checkpoint/Restart

Fa.cilities

for

OOS. • • • • • • •

205

Repair

Features.

• • •

OLTEP

and

OLT's

-

OS

and

DOS

Microdiagnostics

•

RAS

Summary.

• • • • •

• • •

205

• • •

206

•

207

•

207

Section

60:

Programming

Systems

Preinstallation

Planning

for

the

Model

145

in

BC

Mod.e • • • • • • • •

208

60:05

General

Considerations.

• • • • • • • • • • • • •

••

208

60:10

OS

MFT

and

MVT

Transition.

• • • •

..

• • • • • • •

210

Existing

OS

Processin.g

Programs

and

Job

Control

•••••

211

Conversion

to

3330-Se'ries

and

2305

Disk

storage.

• •

211

Conversion

to

the

3410/3411

and

3803/3420

Magnetic

Tape

Subsystems.

• • • • • • • • • • • • • •

'.

• • • • •

212

Conversion

to

the

3505

Card

Reader

and

3525

Card

Punch

•

213

60:.15

Planning

Optimal

system

Performance,

Using

Block

60:20

60:25

60:30

60:35

Multiplexer

Channels

an.d

Rotational

position

sensing

Devices.

• • • • • • • • • • • • • • • • • •

system

Configuration

and

Generation.

• •

'.

•

Job

scheduling

• • • • • • • • • • •

Data

Management

Parameters

• • •

OS

MFT

and

MVT

Portability

• • •

Transition

to

DOS

Versi.on

4

•••••••••••

DOS

Versions

3

and

4

Portability

Use

of

Other

Programming

Systems

•

213

• • •

213

..

214

•

216

•

217

• • •

219

• • •

221

• • •

222

Section

70:

Comparison

Tables

of

Ha.rdware

Features

and

Programming

Support

-

System/360

Models

30

and

40

and

System/370

Model

145.

• • • • • •

..

• • • • • •

'.

• •

'.

• • • • •

224

70:05

Hardware

Features

of

Models

30,

40,

and

145

and

DOS

Version

4

and

os

(MFT

and

MVT)

Support

of

the

Model

145

••

225

70:10

DOS/VS,

OS/VS1,

and

OS/VS2

Support

of

the

Model

145

Operating

in

EC

and

OAT'

Modes.

• • • • • • • •

231

Index

(Sections

01

to

70)

• •

234

Optional

Sections

(See

each

supplement

for

detailed

contents

and

index)

Section

80:

DOS/Virtual

Storage~

Features

• •

245

Section

90:

as/Virtual

Storage

1

Features.

..

• •

247

Section

100:

as/Virtual

Storage~

2

Features

• • • • •

249

Section

110:

Virtual

Machine

Facility/370

Features

• • • •

251

I FIGURES

(Sections

01

to

70)

10.05.1

10.05.2

10.05.3

10.05.4

10.10.1

10.10.2

10.15.1

SLT

substrate.

• • • • • •

.'.

•

'.

• •

'.

• • •

Monolithic

storage

array

module

containing

512

bits.

Monolithic

storage

array

card

containing

12K

bits,.

•

Basic

storage

module

of

the

Model

145

containing

48K

bytes

of

monolithic

storage.

• • • • •

••

• • • • •

BC

and

EC.

mode

PSW

formats

•

..

• • • • • •

'.

• • • •

Model

145

model-independent

fixed

storage

locations

for

BC

and

EC

modes.

• • • • • • • •

Model

145

physical

layout..

• • • • • • • • • • • •

,.

A

Guide

to

the

IBM

System/370

Model

145

11

13

16

17

25

10.15.2

15.05.1

15.05.2

15.05.3

15.05.4

15.10.1

15.10.2

15.10.3

15.10.4

15.15.1

15.15.2

15.15.3

15.15.4

15.15.5

20.10.1

20.10.2

20.10.3

20.15.1

20.15.2

20.25.1

20.27.1

20.27.2

20.30.1

20.30.2

20.30.3

20.30.4

20.30.5

40.05.1

40.15.1

40.15.2

50.10.1

50.10.2

50.10.3

50.10.4

50.10.5

50.10.6

Disk

cartridge

for

the

console

file.

• • • • • • • •

••

28

Names

and

location

of

instructions

and

data

in

a

virtual

storage

environment.

..

• • • • • • • • • • • • • • •

••

50

Relationship

of

virtual

storage,

direct

access

storage,

and

real

storage

• • • • • • • • • • • • • • • • • •

••

51

Conceptual

illustration

of

real'storage

utilization

in

a

mixed

batch

and

online

virtual

storage

environment

••

60

Layout

of

virtual

storage,

external

page

storage,

and

real

storage

• • • • • • • • • • • • • • • • • • • •

••

63

Virtual

storage

address

fields

for

a 64K

segment

• •

••

68

segment

table

and

page

tables

used

for

dynamic

address

translation.

• • • • • • • • • • • •

'.

• • • •

70

Dynamic

address

translation

procedure.

• • • • • • •

••

71

Example

of

IDAL's

required

for

a

CCW

list

when

page

size

is

2K

• • • • • • • • • • • • • • • • • _ • • •

••

77

Possible

system

performance

when

a

virtual

storage

operating

system

is

used

with

an

existing

Model

145

configuration.

• • • • • • • • • • • • • • • • • '. •

81

General

effect

on

page

faults

of

increasing

the

ratio

of

the

virtual

storage

used

to

the

real

storage

present

in

the

system.

•

..

• • • • • • • • • • • • • • • _

86

General

effect

on

system

performance

of

the

paging

factor

only.

• • • • • • • • • • • • •

.•

• • •

87

General

effect

of

the

paging

fact:.or

on

system

performance

for

various

active-to-passive

page

ratios..

88

General

system

performance

curve

for

a

virtual

storage

environment.

• • • • • • • • • • • • • • • • •

3330-series

disk

storage

attached

to

3830

Storage

Control

Modell.

• • • • • • • • • • • • • • • • •

A

Model

145

configuration

with

3330-series

disk

storage

attached

via

3830

Storage

Control

Model

2.

A

Model

145

configuration

with

3330-series

disk

89

97

100

storage

attached

via

integrated

storage

control.

• •

101

Top

view

of

a

2305

Model

2

disk

surface.

• • • • •

104

Multipie

requesting

on

the

2305

facility

• • • • • •

106

Tape

switching

configurations

for

the

3803/3420

Magnetic

Tape

subsystem

• • • • • • • • • • • • • • •

The

3410

Magnetic

Tape

Unit.

• • • • • • •

3410/3411

tape

subsystem

physical

layouts,.

The

3505

Card

Reader

• • • •

The

3525

Card

Punch

• • • • • • • •

Vertical

mark

card

format

Card

layout

for

25

print

lines

• • •

'.

• •

Contents

of

operator

panels

for

3505

reader

and

3525

punch

• • • • • • • • • . • • . .

'.

• • • . •

Partition

or

region

layout

for

an

OS

1400/7010-series

emulator

program

job

step,

with

general

storage

115

122

123

129

133

137

141

requirements

indicated

• • • • • • • • • • • • •

'.

• • •

159

Sample

256K

Model

145

configuration

for

emulation

of

a

128K

DOS

system

••••••••••••••••••••

184

Sample

160K

Model

145

configuration

for

emulation

of

a

48K

DOS

system

• •

..

•

••

• • • • • • • • •

..

• • • •

184

Data

representation

used

in

Model

145

processor

and

control

storage

••••••••••

'

••

'

••••••

,

•••

188

Data

representation

used

in

Models

30

and

40

processor

storage

and

in

the

Model

145

in

other

than

processor

and

control

storage.

• •

••

• • • •

••

• • • • •

188

Model

145

model-dependent

fixed

storage

locations.

•

'.

•

191

Model

145

machine

check

code

• • • • • • • • • • • • • •

193

General

flow

of

OS

MCR

processing

after

repressible

machine

check

conditions

• • • • • • • • • • •

198

General

flow

of

os

error

recovery

procedures

after

an

I/O

interruption

• • • • • • • • • • • • • • •

201

A

Guide

to

the

IBM

Systern/370

Model

145

TABLES

(sections

01

to

70)

10.15.1

10.20.1

10.20.2

15.10.1

15.10.2

20.10.1

20.10.2

20.10.3

20.15.1

20.15.2

20.15.3

20.25.1

20.25.2

20.27.1

20.30.1

20.30.2

20.30.3

40.05.1

40.05.2

40.05.3

40.05.4

40.05.5

40.05.6

40.05.7

40

..

05.8

40.10.1

40.10.2

40.10.3

40.10.4

40.10.5

Total

control

storage

requirements

for

sample

Model

145

hardware

configurations.

• • • • • • • • •

..

• • • •

••

27

Sample

Model

145

I/O

configurations

without

the

Channel

Word

Buffer

feature

installed.

• • • • • • • • • • •

...

33

sample

Model

145

I/O

configurations

with

the

Channel

Word

Buffer

feature

installed.

• • • •

..

•

4O4O

•

'4O

•

4O4O

33

Number

and

size

of

segments

and

pages

for

a

16-million-

byte

virtual

storage

..

• •

..

•

I.

,4O

'4O

• • • • • •

"4O

67

Virtual

and

real

storage

addresses

used

by

and

supplied

to

programs

in

the

Model

145.

• • • • • • • • • • •

f40

73

Capacity

and

timing

characteristics

of

3330-series

and

2314

disk

storage

and

the

2321

Data

Cell

Drive

• • •

4O"

96

3336

and

2316

Disk

Pack

characteristics.

• •

'4O

• • •

.4O

97

Hardware

features

of

3330-series

and

2314

disk

storage

•

102

2305

Model

2

facility

and

2303

Drum

Storage

characteristics.

• •

..

• •

..

• • • • • • • • • •

106

Effective

capacity

of

the

2305

Model

2

and

the

2303

for

various

block

sizes

with

a

25-byte

key

..

•

108

Effective

capacity

of

the

2305

Model

2

and

the

2303

for

various

block

si.zes

when

records

are

written

without

key.

..

•

..

• • • •

..

• •

..

• • •

.•

'. • • •

'.

•

108

3803

€ontrol

unit

configurations

and

capabilities

with

Single

Density,

Dual

Density,

and

Seven

Track

features

•

114

3420

and

2401

Magnetic

Tape

Unit

characteristics

'.

118

3410,

2401,

and

2415

Magnetic

Tape

unit

characteristics.

..

•

..

• •

..

•

..

•

..

• • •

125

3505

Card

Reader

and

3525

Card

Punch

features

130

3525,

557,

and

1404

Icard-printing

capabilities

• •

139

3505

reader,

3525

pwnch,

and

2540

reader/punch

feature

comparison

..

• • •

..

•

..

• • •

143

1410/7010

system

feat.ures

supl:Jorted

and

unsupported

by

the

Model

145

OS

1410/7010

Emulator

program.

'4O

•

164

1410/7010

I/O

devices

and

features

emulated

by

the

OS

1410/7010

Emulato:['

program

and

their

Model

145

equivalents.

.. ..

•

..

•

..

.. ..

• •

..

.. .. ..

• • • •

165

1410/7010

I/O

devices

not

supported

by

the

Model

145

OS

1,4

1

0/701

0

Emula

tOj[,

program.

•

..

'.

• • •

'. '. '.

...

165

Model

145

direct

accless

device

requirements

for

emulation

of

1410/7010

disk

devices

using

OS

with

and

without

the

Track

OVlerflow

feature

•

..

'. •

..

• •

166

1401/1440/1460

system

features

supported

by

the

Model

145

OS

1401/141~0/1460

Emulator

program

........

167

1401/1440/1460

I/O

dlevices

and

features

emulated

by

the

,OS

1401/1440/1460

Emulator

program

and

their

Model

145

counterparits

• • • •

..

•

..

•

.. ..

•

'4O

..

••

167

1401/1440/1460

I/O

dievices

and

features

not

supported

by

the

Model

145

OS

1401/1440/1460

Emulator

program.

• •

168

Model

145

direct

accless

device

requirements

for

emulation

of

1401/141~0/1460

disk

devices

using

os

with

and

without

the

Track

overflow

feature.

• • • •

168

1401/1440/1460

I/O

dievices

and

features

supported

by

the

DOS

1401/1440/14450

Emulator

program

and

corresponding

Model

145

devices.

..

• • '.

..

• • • •

174

1401/1440/1460

CPU

fieatures

supported

by

the

OOS

1401/1440/1460

Emula1tor

program

......

'4O

• •

..

174

1401/1440/1460

devicies

not

supported

by

the

DOS

1401/1440/1460

Emula1tor

program

.....

'

.............

175

1410/7010·1/0

devices

and

features

supported

by

the

OOS

1410/7010

Emulator

program

and

corresponding

Model

145

devices.

•

..

,4O

..

• •

'.

• •

..

•

176

1410/7010

CPU

featuri~s

supported

and

unsupported

by

the

DOS

1410/7010

Emulator

program.

•

•••••

'

.....

176

A

Guide

to

the

IBM

System/370

~)del

145

40.10.6

50.10.1

1410/7010

devices

not

supported

by

the

DOS

1410/7010

Emulator

program

• • • • • • • • • • • •

Model

145

machine

check

interruptions.

176

192

A

Guide

to

the

IBM

System/370

Model

145

SECTION

01:

SYSTEM

HIGHLIGHT~

The

system/310

Model

145

is

olesigned

to

enhance,

extend,

and

broaden

the

successful

concepts

of

SystE!ll1/360

and

to

provide

significant

new

functions

that

do

not

necessitat.e

a

major

reprogramming

effort.

It

is

a

general

purpose

growth

system

for

System/360

Model

40

and

large

Model

30

users

that

offers

significant

p.rice

performance

improvement

in

addition

to

many

new

features.

The

Syste!m/310

Model

145

retains

and

extends

the

wide

range

of

commercial

and

sci.entific

data

processing

capabilities

offered

by

System/360

Models

30

and

40.

It

also

offers

functions

designed

to

facilitate

new

appli.cation

development

and

to

ease

entry

into,

and

expansion

of,

online

clata

processing

operations.

The

Model

145

is

compatible

with

other

Sys:tem/310

models.

Transition

from

system/360

models

to

the

System/310

Model

145

can

be

accomplished

with

a

minimum

of

e!ffort

because

most

current

System/360

user

programs,

I/O

devices,

and

programming

systems

are

upward

compatible

with

the

new

system.

Additional

capabilities

are

included

in

os

MFT

and

MVT

and

in

DOS

Versions

3

and

4

to

support

certain

new

features

of

the

Model

145,

there~by

providing

proven

operating

system

performance

as

well

as

continuit.y.

Compatible

growth

from

System~360

operating

systems

to

a

Model

145

virtual

storage

environment

can

be

aChieved

using

the

new

System/310

operating

systems:

Dos/virtual

Storage

(DOS/VS),

OS/Virtual

Storage

1

(OS/VS1),

and

OS/Virtual

Storage

2

(OS/VS2),

which

are

based

on

DOS

Version

4,

OS

MFT,

and

OS

MVT,

respectively.

These

new

operating

systems

will

run

only

on

system/310

models

with

extended

System/310

functions,

namely

on

those

with

extended

control

mode

of

system

operation

and

dynamic

address

translation

facilities.

In

addition

to

supporting

virtual

storage,

the

System/310

operating

systems

offer

several

other

new

capabilities

and

performance-oriented

enhancements

that

are

not

provided

by

DOS

Version

4

or

OS

MFT

and

MVT.

A

virtual

machine

environment

is

supported

by

Virtual

Machine

Facility/310

(VM/310),

the

successor

to

CP/61

for

System/310.

While

CP/61

is

available

only

to

Model

61

System/360

users,

VM/370

operates

on

System/370

Models

135,

145,

155

II,

158,

165

II,

and

168.

Transition

with

little

or

no

reprogramming

is

also

provided

for

1401/1440/1460

and

1410/1010

use.rs

and

for

those

presently

emulating

these

systems

on

System/360.

Improved

emulators

for

these

systems

that

operate

under

OS

(MFT,

MVT,

VS1,

and

VS2)

or

DOS

(Versions

3,

4,

and

VS)

control

on

the

Model

145

are

available.

DOS

users

who

wish

to

install

OS

on

their

Model

145

can

ease

the

transition

by

using

the

standard

OS/DOS

Compatibility

feature.

An

OS

DOS

Emulator

program

is

provided

that

supports

emulation

of

a

DOS

Version

3

or

4

multiprogramming

:system

under

OS

(MFT,

MVT,

VS1,

or

VS2)

control.

Highlights

o:f

the

Model

1

••

5

are

.as

follows:

•

Upward

compatibility

with

mo:st

System/360

architecture

and

programming

has

been

maintained

through

implementation

of

the

basic

control

(BC)

mode

of

system

operation.

An

extended

control

(EC)

mode

of

operation,

not

implemented

in

system/360,

is

also

provided

•

Internal

performance

of

a Mod.el

145

operating

in

Be

mode

is

from

approximately

three

to

five

itimes

that

of

the

Model

40

for

a

typical

instruction

mix.

A

Guide

to

the

IBM

system/370

.Model

145

1

2

•

The

following

are

CPU

features

of

the

Model

145.

Implementation

of

a

basic

control

mode

and

an

extended

control

mode

of

system

operation

is

standard.

When

the

Model

145

is

operating

in

BC

mode,

DOS

Ver'sions

3

and

4,

OS

MFT,

and

OS

MVT

can

be

used.

When

the

Model

145

operates

in

EC

mode,

the

PSW

format

and

the

layout

of

permanently

assigned

lower

processor

storage

are

altered

to

support

additional

system

control

and

new

functions

(such

as

dynamic

address

translation)

that

are

not

provided

in

BC

mode.

DOS/VS,

OS/VS1,

OS/VS2,

and

VM/370

support

EC

mode

operations.

with

a

few

exceptions,

existing

user-written

problenl

programs

that

operate

under

DOS

Version

4,

OS

MFT,

or

OS

MVT

can

operate

under

DOS/VS,

OS/VS1,

or

OS/VS2,

respectively,

without

modification.

Dynamic

address

translation

(DAT)

is

a

standard

facility

that

can

operate

only

in

EC

mode.

It

provides

translation

of

addresses

during

program

execution.

One

virtual

storage

of

up

to

16

million

bytes

or

multiple

virtual

storages

of

up

to

16

million

bytes

each

can

be

supported

using

DAT

hardware.

(The

size

of

the

virtual

storage

that

can

be

efficiently

supported

on

a

Model

145

depends

on

the

hardware

configuration

and

job

stream

characteristics.)

DAT

is

a

standard

feature

on

all

System/370

models

that

have

EC

mode.

In

System/360,

DAT

is

implemented

only

in

the

Model

67.

Channel

indirect

data

addressing

is

also

standard

and

is

provided

to

handle

I/O

operations

when

DAT

is

used,

because

an

I/O

buffer

area

can

span

a

set

of

noncontiguous

processor

storage

areas.

The

Model

145

standard

instruction

set

includes

new

general

purpose

instructions

in

addition

to

the

powerful

System/360

instruction

set.

These

instructions

enhance

decimal

arithmetic

performance,

simplify

the

handling

of

nonword-size

data

that

is

processed

using

the

general

registers,

eliminate

the

need

for

multiple

move

or

compare

instructions

or

move

subroutines,

simplify

system

mask

handling,

and

facilitate

record

blocking

and

deblocking,

field

padding,

and

storage

clearing.

Other

new

instructions

are

provided

primarily

for

control

program

use.

A

floating-point

arithmetic

option

is

available

that

provides

for

floating-point

operations,

including

extended

precision

operations.

Precision

of

up

to

28

hexadecimal

digits,

equal

to

up

to

34

decimal

digits,

is

provided

by

the

extended

precision

data

format.

A

monitoring

feature

is

standard

that

can

be

used

to

trace

user-

defined

program

events

for

the

purpose

of

debugging

or

statistics

gathering.

Program

event

recording

is

standard

and

also

is

designed

to

be

used

as

a

problem

determination

aid.

This

feature

includes

hardware

that

monitors

the

following

during

instruction

execution:

successful

branches.

the

alteration

of

general

.registers,

and

instruction

fetching

from

and

alterations

of

specified

areas

of

processor

storage.

It

can

operate

only

when

the

Model

145

is

in

EC

mode

.•

An

interval

timer

of

3.33-ms

resolution

to

improve

job

accounting

accuracy

is

standard.

(A

16.6-ms

resolution

timer

is

provided

for

Models

30

and

40.)

A

time

of

day

clock

is

included

as

a

standard

feature

to

provide

more

accurate

time

of

day

values

than

does

the

interval

timer.

The

clock

has

a

1-microsecond

resolution.

The

CPU

timer

and

the

clock

comparator

are

optional.

The

CPU

timer

provides

an

interval

timing

capability

similar

to

that

of

the

interval

timer

at

location

80

but

it

is

updated

every

microsecond,

A

Guide

to

the

IBM

System/370

Model

145

as

is

the

time

of

day

clock.

The

clock

comparator

can

be

used

to

cause

an

interruption

when

t.he

time

of

day

clock

passes

a

specified

value.

These

items

provide

higher

resolution

timing

facilities

than

the

standard

interval

timer

and

enable

more

efficient

timing

facility

routines

to

be

writ.ten

..

The

byte-oriented

operands

f:acility

permits

byte

boundary

alignment

for

the

operands

of

nonprivileged

instructions

to

eliminate

the

necessity

of

adding

padding

bytes

within

records

or

to

blocked

records

for

the

purpose

of

a.ligning

fixed-

or

floating-point

data.

Retry

of

failing

CPU

operations

is

handled

automatically

by

the

hardware,

without

programmin.g

assistance.

•

Functionally

improved

relocatable

emulators

are

available

that

operate

under

operating

system

control,.

Concurrent

execution

of

system/310

programs.

with

any'

combination

of

1401,

1440,

1460.

1410.

and

1010

programs

in

a

multiprogramming

environment

is

supported.

The

1401/1440/1460

and

the

1401/40/60,

1410/1010

Compatibility

features

are

optional,

no-charge

features.

These

emulators

are

supported

by

DOS

Versions

3

and

4,

DOS/VS,

and

OS

MFT,

MVT,

VS1,

and

VS2.

•

The

standard

OS/DOS

Compatibility

feature

permits

emulation

of

a nos

Version

3

or

4

system

under

os (MFT,

MVT,

VS1,

or

VS2),

concurrently

with

execution

of

other

OS

jobs.

Both

DOS

emulation

and

1400/1010

emulation

can

operate

together

on

a

Model

145

under

OS

control.

•

Operator

console

devices

with

an

alter/display

mode

are

available.

The

15-cps

3210

Mo~el

1

Console

Printer-Keyboard

or

the

85-cps

3215

Model

1

Console

Printer-Keyboard

is

required.

A

remote

3210

Model

2

Console

Printer-Keyboard

can

be

installed

in

addition

to

either

of

the

other

printer-keyboards.

•

The

following

channel

featur,es

are

available

for

the

Model

145:

Up

to

four

high-speed

selector

channels

can

be

attached

(one

selector

is

standard)

in

addition

to

the

standard

byte

multiplexer

channel.

Up

to

256

subchann1els

can

be

installed

on

the

byte

multiplexer

channel.

An

individual

selector

channel

can

operate

at

a

data

rate

of

.82

megabytes

per

second

(MB).

With

a

special

feature,

a

selector

channel

,can

operate

at

a

1.

85-MB

data

rate

and

therefore

.support

significan-t:1y

faster

I/O

devices

than

can

Model

30

and

40

channels.

Block

mu1

tiplexer

mode

of

op1eration

for

selector

channels

is

a

no-

charge

optional

feature.

A

block

multiplexer

channel

is

a

superset

of

a

selector

channel.

When

used

in

conjunction

with

rotational

position

sensing

devices,

sUlch

as

3330-series

and

2305

Model

2

direct

access

storage

device:!3,

block

multiplexer

channels

can

increase

total

system

throughput

by

permitting

increased

amounts

of

data

to

enter

and

leave

the

l:iystem

in

a

given

time

period.

A

single

block

multiplexer

channel

Calrl

support

interleaved,

concurrent

execution

of

multiple

high-speed

I/O

operations.

The

optional

Integrated

File

Adapter

feature

allows

lower

cost,

direct

attachment

of

2314A-t:vpe

disk

drives

to

a

Model

145.

A

selector

channel

and

a

disk

4::ontrol

unit

are

not

required.

The

2319

Disk

storage

units

(Models

A1

and

A2

with

three

drives

each),

2312

Disk

storage

(one

drive)"

2313

Disk

storage

(four

drives),

and

2318

Disk

storage

(two

drives)

Calrl

be

.

connected

to

the

adapter

for

a

configuration

of

from

three

ito

eight

natively

attached

disk

drives.

Facilities

consisting

of

f:rom

one

to

eight

2314-type

disk

drives,

plus

a

spare,

can

also

be

channel

attached

to

the

Model

145.

A

Guide

to

the

IBM

System/310

Mociel

145

3

4

Channel

retry

data

is

provided

when

channel

errors

occur

so

that

error

recovery

routines

can

retry

I/O

operations.

•

The

following

significant

new

storage

features

are

provided

by

the

Model

145:

All

system

storage--Iocal,

control,

and

processor

(main)--is

implemented

using

monolithic

technology

instead

of

discrete

ferrite

cores.

From

160K

to

512K

of

monolithic

processor

(main)

storage

is

available--twice

the

maximum

main

storage

available

on

the

Model

40.

Four

data

bytes

can

be

fetched

in

540

nanoseconds,

while

four

data

bytes

can

be

stored

in

607.5

nanoseconds.

Reloadable,

monolithic

control

storage

is

used

to

contain

the

microcode

necessary

for

system

operation.

Control

storage

contains

the

microcode

required

for

standard

and

optional

features

and

can

be

expanded

from

32K

to

64K

in

2K

increments,

as

required.

Use

of

writable,

instead

of

read-only,

control

storage

offers

the

advantages

of

system

cost

reduction

and

improved

system

serviceability.

Error

checking

and

correction

(ECC)

hardware,

which

automatically

corrects

all

single-bit

processor

and

control

storage

errors

and

detects

all

double-bit

and

most

multiple--bit

errors,

is

standard

•

I/O

devices

for

the

Model

145

include

the

following.

Most

I/O

devices

for

System/360

Models

25,

30,

and

40

can

be

attached.

'I'he

3505

Card

Reader

and

the

3525

Card

Punch

with

optional

card

read

capability

can

be

attached.

A

variety

of

models

are

available.

They

offer

80-column

card

users

configuration

flexibility,

new

functions,

high

reliability,

and

greatly

expanded

error

recovery

facilities.

Models

Bl

and

B2

of

the

3505

Card

Reader

can

operate

at

800

and

1200

cards

per

minute,

respectively.

Significant

new

features

include

optical

Mark

Reading

(optional)

and

Read

Column

Eliminate

(standard).

The

latter

permits

successful

reading

of

cards

containing

internal

perforations

or

other

holes

that

would

normally

cause

an

error.

Models

Pl,

P2,

and

P3

of

the

3525

Card

Punch

can

punch

and,

optionally,

read

100,

200,

and

300

cards

per

minute,

respectively.

New

features

of

this

unit

include

automatic

punch

retry

when

an

error

is

detected

(standard)

and

card

printing,.

A

two-line

print

option

and

a

multiline

(up

to

25

lines)

print

option

are

available.

The

3803/3420

Magnetic

Tape

Subsystem

is

attachable.

Models

3,

5,

and

7

of

the

3420

Magnetic

Tape

Unit,

with

data

rates

of

120

KB,

200

KB,

and

320

KB,

respectively,

at

1600-BPI

recording

density,

are

provided.

Phase-encoded

recording,

which

permits

automatic

correction

of

all

single-bit

read

errors

in

flight,

is

used.

This

new

tape

SUbsystem

offers

improved

price

performance;

Dual

Density

and

Seven

Track

features

for

compatibility

with,

and

conversion

of,

2400-series

tape

volumes;

greatly

reduced

operator

handling

through

implementatiQn

of

such

features

as

automatic

tape

threading

and

cartridge

loading;

lower

cost

tape

switching

than

is

provided

for

2400-series

tape

units;

and

enhanced

reliability,

availability,

and

serviceability

features.

A

Guide

to

the

IBM

System/310

Model

145

The

3410/3411

Magnetic

Tape

Subsystem,

Models

1,

2,

and

3,

can

be

attached

to

provide

data

rat.es

of

20

KB,

40KB,

and

80

KB,

respectively,

at

1600-BPI

de:nsity.

Phase-encoded

recording

is

used.

A

Model

1

subsystem

can

consist

of

from

one

to

four

tape

units.

Models

2

and

3

of

the

subsystem

can

have

from

one

to

six

tape

units.

This

subsystem

offers

improv'ed

price

performance

for

data

rates

under

120

KB, a

simplified

tape

path

to

speed

tape

setup,

Dual

Density

and

Seven

Track

features,

a

totally

new

compact

physical

design

that

minimizes

floor

space

requirements,

and

reliability,

availability,

and

serviceability

improvements.

The

high-speed

3211

printer,

with

a

tapeless

carriage

and

print

speed

of

2000

alphameric

lines

per

minute,

is

attachable.

The

tapeless

carriage

decreases

operator

intervention

by

eliminating

carriage

tape

loading

and

unloading.

The

3330-series

disk

storage

can

be

attached

via

3830

Storage

Control

(Models

1

and

2)

and

via

Integrated

Storage

Control.

The

3330-series

offers

significantly

faster

seeks

and

more

than

twice

the

data

rate

of

the

2314.

Eight

3330-series

drives

offer

more

than

three

times

the

capacity

of

eight

2314

drives.

Automatic

error

correction

features,

rotational

position

sensing,

and

multiple

requesting

are

also

provided

as

standard

features.

The

3330

has

an

806-KB

data

transfer

rate,

average

seek

time

of

30

ms,

and

full

rotation

time

of

16.1

ms.

A

3330-series

drive

has

a

maximum

capacity

of

100

million

bytes.

A

string

of

two,

four,

six,

or

eight

3330-series

drives

,can

be

,configured.

Model

1

of

3830

Storage

Control

can

handle

one

string.

of

up

to

eight

drives.

Model

2

of

3830

Storage

Control

anlti

Integrated

storage

Control

can

handle

one

or

two

strings

of

up

to

,eight

drives

each.

The

2305

facility

Model

2,

with

a

maximum

single

module

capacity

of

11.2

million

bytes,

a

data

r,ate

of

1.5MB,

and

an

average

access

of

5

ms,

can

be

attached

to

a

Model

145

to

be

used

as

a

system'

residence

device

or

as

high-speed

storage.

One

2305

Model

2

facility

can

include

two

modules

for

a maximum

facility

capacity

of

22.4

million

bytes

•

Extensive

hardware

and

progr~amming

systems

error

reco~ery

and

repair

features

are

provided

to

enhance

system

reliability,

availability,

and

serviceability.

•

Compact

physical

design

redu4ces

Model

145

space

requirements.

The

Model

145

has

almost

three

times

the

number

of

circuits

as

a

Model

40,

yet

a

256K,

five-channel

system

requires

about

the

same

amount

of

space

as

a

256K,

three-chi:mnel

Model

40.

As

the

highlights

indicate,

Model

30

and

40

users

now

have

a

broader

range

of

Model

145

configurations

from

which

to

choose

when

tailoring

a

growth

system

with

i~provedthrollghput

and

expanded

capabilities.

Specifically"

the

Model

145

offelC's

the

following

advantages

when

compared

to

Models

30

and

40.

Larger,

Faster

Processor

(Main)

!:;toraqe

Sizes

Processor

storage

sizes

of

160K,

208K,

256K,

384K,

and

512K

bytes

are

provided.

The

Model

30

can

have

a

maximum

of

64K,

while

256K

is

the

largest

main

storage

size

available

for

a

Model

40.

The

cycle

time

of

Model

145

processor

storage

is

aJlOut

four

times

faster

than

that

of

the

Model

40.

This

improved

cycle

time

increases

internal

performance

and

permits

faster

I/O

devices

to

be

attached

to

the

system.

A

Guide

to

the

IBM

System/310

Model.

145

Additional

storage

can

contribute

significantly

to

system

capabilities

and

performance.

Specifically,

the

addition

of

more

processor

storage

provides

the

Model

145

user

with

the

ability

to:

•

Execute

more

or

larger

jobs

concurrently,

including

new

application

and

integrated

emulator

jobs

•

Add

and

expand

applications,

such

as

graphics,

teleprocessing,

time

sharing,

and

data

base,

tha-t

require

larger

amounts

of

storage

•

Use

higher

leve1

language

translators

and

linkage

editors

that

provide

more

functions

and

execute

faster

•

Execute

larger

processing

programs

without

the

necessity

of

overlay

structures

•

Allocate

more

storage

to

language

translators

and

sorts

to

improve

their

execution

speed

•

Use

more

and

larger

I/O

buffers

to

speed

up

input/output

operations

and

optimize

use

of

direct

access

storage

and

tape

media

space

•

Include

system

generation

options

that

improve

control

program

performance

and

support

additional

functions

support

of

~

Virtual

Storage

Environment

While

the

Model

145

has

larger

processor

storage

than

its

comparable-

scale

System/360

models,

it

also

provides

the

capability

of

implementing

a

virtual

storage

environment,

whi'ch

allows

programmers

to

write

and

execute

programs

that

are

larger

than

the

processor

storage

available

to

them.

When

virtual

storage

is

supported,

many

of

the

restraints

normally

imposed

by

the

amount

of

processor

storage

actually

available

in

a

system

are

eased.

The

removal

of

certain

restraints

can

enable

applications

to

be

installed

more

easily,

and

can

be

valuable

in

the

installation

and

operation

of

online

applica"tions.

While

many

of

the

new

hardware

features

and

I/O

devices

for

the

Model

145

and

the

new

facilities

supported

by

System/310

operating

systems

are

designed

to

improve

performance,

a

virtual

storage

environment

is

designed

primarily

to

help

improve

the

productivity

of

data

processing

personnel

and

enhance

the

operational

flexibility

of

the

installation,.

Greatly

Expanded

Channel

Capabilities

The

fast

internal

performance

of

the

Model

145,

together

with

expanded

use

of

multiprogramming,

requires

that

more

data

be

available

faster

than

on

the

Model

40.

A

variety

of

channel

options

are

provided.

Twice

the

number

of

byte

multiplexer

subchannels

can

be

installed

on

a

Model

145

as

on

a

Model

40.

The

Model

145

also

offers

more

and

faster

high-speed

channels

than

Models

30

and

40,

and

block

multiplexer

channels

not

provided

for

these

System/360

models.

The

basic

individual

channel

data

rate

of

.82

MB

can

be

more

than

doubled

by

installation

of

the

optional

Channel

Word

Buffer

feature.

6

The

channel

features

of

the

Model

145

provide:

•

Up

to

256

byte

multiplexer

subchannels

for

larger

teleprocessing

users

•

Lower

cost

direct

attachment

of

2314A-type

disk

storage

drives

via

the

new

Integrated

File

Adapter

•

Attachment

of

high-speed

direct

access

devices

such

as

the

3330-

series

and

2305

Model

2

A

Guide

to

the

IBM

Syste11V310

Model

145

•

Potential

increases

in

channel

throughput

via

use

of

block

multiplexing

and

rotational

position

sensing

to

improve

effective

data

transfer

rates

• A

significantly

higher

attainable

aggregate

channel

data

rate

than

the

Model

40

to

balance'

the

higher

performance

capabilities

of

the

Model

145

CPU

Faster

I/O

Devices

and

Increasec~

Direct

Access

Storage

Capacity

The

Model

145

supports

a

fast:er

magnetic

tape

unit

than

do

Models

30

and

40--specifically,

the

3420

ltlodel

7

with

a

data

rate

of

320

KB.

A

Model

145

I/O

configuration

can

also

include

significantly

more

and

faster

direct

access

storage.

l~or

example,

the

Model

145

is

not

limited

to

having

2314

facilities

on

onl.y

one

channel,

as

are

Models

30

and

40.

In

addition,

the

3330-series

and

2305

Model

2

provide

considerably

more

capacity

and

faster

data

access

than

2314

facilities

or

2303

Drum

Storage

because

of

higher

data

t~ransfer

rates,

faster

rotation,

and

new

features.

IJ.'hese

direct

access

devices

also

offer

higher

availability

through

use

of

new

hardware-oIlly

and

program-assisted

error

correction

features.

The

3330-series

provides

largre

capacity

and

fast

access

for

a

lower

cost

per

bit.

It

is

a

growth

de!vice

that

offers

improved

price

performance

for

the

2314

facilit~y

and

the

2321

Data

Cell

Drive.

The

3330-series

is

designed

to

be

us:ed

in

every

area

in

which

direct

access

storage

is

needed,

for

example:

•

As

a

system

residence

device~

and

for

program

library

storage

•

In

teleprocessing

applications

for

message

queuing

and

for

residence

of

online

applications

data

•

In

online,

data

base

applications,

such

as

management

information

systems

•

In

time

sharing

(or

interact,ive)

environments

as

swap

devices

and

for

online

work

storage

(foz'

program

and

data

residence)

•

As

high-speed

work

storage

f'or

sorting,

assembling,

and

link

editing

•

For

residence

of

data

indexes,

such

as

for

ISAM

data

sets

•

As

external

page

storage

in

a

virtual

storage

environment

The

2305

Model

2

facility

off'ers

significantly

faster

access

than,

and

almost

three

times

the

capacity

of,

the

2303

drum.

In

large

Model

145

OS

installations,

the

2305

facility

will

be

of

benefit:

• As

the

pr;imary

system

residence

device

•

In

time

sharing

environments

as

a

swap

device

and

for

program

and

data

residence

• As

high-speed

work

storage

and

for

residence

of

data

indexes

• As

external

page

storage

in

a

virtual

storage

environment

A,

Guide

to

the

IBM

System/370

Model

145

7

Summary

The

combination

of

new

and

enhanced

hardware,

availability,

and

input/output

facilities,

expanded

operating

system

support,

integrated

1400/1010

emulation,

and

DOS

emulation

under

OS

provided

by

the

Model

145

offers

Model

30

and

40

users

expanded

computing

capabilities

without

the

necessity

of

a

large

conversion

effort..

Little

or

no

time

need

be

spent

modifying

operational

System/360

code

or

programs

currently

being

emulated.

Users

of

1400-series

and

7010

systems

can

upgrade

directly

to

a

Model

145

and

an

operating

system

environment

with

a

minimum

of

reprogramming,

and

DOS

users

can

convert

to

OS

more

easily

because

of

the

availability

of

DOS

emulation.

Existing

CPU-bound

System/360

programs

can

execute

faster

because

of

the

increased

internal

performance

of

the

Model

145,

while

I/O-bound

programs

can

benefit

from

the

use

of

more

storage,

more

channels,

faster

I/O

devices,

and

block

multiplexing.

The

increased

power

and

new

functions

of

the

Model

145

provide

the

base

for

expanded

applications

installation

and

penetration

of

previously

marginal

application

areas.

New

applications

installation

and

transition

to

more

online

operations

can

be

easier

when

a

virtual

storage

environment

is

implemented.

The

improved

price

performance

of

the

Model

145

offers

the

user

the

opportunity

to

widen

his

data

processing

base

at

a

lower

cost

than

was

previously

possible.

8 A

Guide

to

the

IBM

System/370

Model

145

SECTION

10:

ARCHITECTURE DESIGN,_

SYSTEM

TECHNOLOGY,

AND

SYSTEM

COMPONENTS

10:05

ARCHITECTURE DESIGN

AND

Sl:STEM

TECHNOLOGY

ARCHITECTURE DESIGN

The

basic

design

objectives

enWodied

in

the

System/370

Model

145

provide

System/360,

1401/1440/14fiO,

and

1410/7010

users

with

a

growth

system

in

the

intermediate

systenl

range

that

incorporates

improvements

and

additions

to

System/360

architecture.

The

Model

145

provides

significant

new

functional

capabilities,

performance

improvements,

and

features

to

enhance

system

reliability,

availability,

and

serviceability.

This

has

been

achieved

under

the

following

conditions:

•

System/370

architecture

is

u~Mard

compatible

with

that

of

System/360

so

that

most

user

programs

written

for

System/360

will

run

efficiently

on

the

Model

145

without

modification.

•

Programming

systems

support

f:or

the

Model

145

is

based

on

certain

programnu.ng

currently

providE!d

for

System/360

models,

namely,

OS

(MFT'

and

MVT)

and

DOS

VersiollL

3.

•

Most

currently

announced

Syst~em/360

I/O

devices

will

operate

on

the

Model

145.

(See

Section

20:0S

for

a

list

of

the

I/O

devices

that

are

not

included

in

a

standa:r'd

Mod~l

145

configuration.)

•

The

open-ended

design

charact~eristic

of

System/360

has

been

preserved

and

extended

on

Sys:tem/370.

Extended

System/370

architectu~e

embodies

two

different

modes

of

system

operation,

basic

control

n~e

and

extended

control

mode,

as

determined

by

bit

12

of

the

curre!nt

PSW. When a

System/370

model

operates

in

BC

mode,

the

contents;,

layout,

and

function

of

permanently

assigned

processor

storage

locations

0

to

127

are

identical

to

these

locations

in

System/360

Models

22

and

up

(except

44

and

67)

with

the

exception

of

the

use

of

PSW

bit

12.

Be

mode

essentially

is

the

System/360-compatible

mode

of

SYSitem/370

operation.

When

EC

mode

is

operative

in

t~he

Model

145,

the

format

of

the

PSW

is

altered

and

the

number

of

permanE!ntly

assigned

locations

extends

beyond

processor

storage

address

127.

Changes

,to

the

PSW

consist

of

removal

of

certain

fields

to

create

space

for

additional

mode

and

mask

bits

that

are

required

for

new

System/310

functions,

such

as

dynamic

address

translation

and

program

event

recording.

The

removed

fields

are

assigned

to

locations

above

127

a.nd

to

a

control

register,.

EC

mode

is

effective

when

PSW

bit

12

is

a

one.

BC

mode

is

effective

if

this

bit

is

a

zero.

BC

mode

is

established

during

initial

program

reset.

Therefore,

a

control

progrram

must

turn

on

bit

12

of

the

PSW

in

order

to

cause

EC

mode

to

become

operative.

As a

result,

control

and

processing

programs

written

for

System/360

(Models

22

and

up

except

44

and

61)

will

run

without

modificaltion

in

BC

mode

on

a

System/310

Model

145

that

has

a

comparable

hardwa:r'e

configuration,

with

the

following

exceptions:

1.

Time-dependent

programs.

(They

mayor

may

not

execute

correctly.)

2.

Programs

that

use

machine--dependent

data

such

as

that

which

is

logged

in

the

machine-depE!ndent

logout

area.

(OS SER

and

DOS

A

Guide

to

the

IBM

System/370

Moclel

145

9

MCRR

error-logging

routines

for

System/360

models

will

not

execute

correctly.)

3.

Programs

that

use

the

ASCII-mode

bit

in

the

PSW

(bit

12).

ASCII

mode

is

not

implemented

and

this

mode

bit

is

used

in

System/310

to

specify

BC

or

EC

mode

of

operation~

4.

Programs

that

depend

on

the

nonusable

lower

processor

storage

area

being

smaller

than

104

bytes.

This

area

can

be

reduced

to

512

bytes

by

moving

the

CPU

extended

logout

area.

(See

Section

50.)

5.

Programs

deliberately

written

to

cause

certain

program

checks.

6.

Programs

that

depend

on

devices

or

facilities

not

implemented

in

the

Model

145.

1.

Programs

that

use

model-dependent

operations

of

the

System/310

Model

145

that

are

not

necessarily

compatible

with

the

same

operations

on

System/360

models.

8.

Programs

that

depend

on

the

validity

of

storage

data

after

system

power

has

been

turned

off

and

then

on.

Note

that

these

are

the

same

types

of

implementation-dependent

restrictions

that

exist

for

compatibility

among

System/360

models.

os

and

DOS

control

programs

are

designed

to

support

either

BC

or

EC

mode

of

system

operation.

Support

of

Model

145

systems

operating

in

BC

mode

is

provided

by

DOS

Versions

3

and

4

and

by

OS

MFT

and

MVT,

each

of

which

is

extended

to

support

certain

new

System/310

hardware

features

and

I/O

devices.

EXisting

DOS

Version

3,

OS

MFT,

and

OS

MVT

control

programs

generated

for

System/360

models

can

also

be

executed

on

a

Model

145

operating

in

BC

mode,

if

necessary

(discussed

in

section

60:30).

Support

of

Model

145

systems

operating

in

EC

mode

is

provided

by

DOS/VS,

OS/VS1,

OS/VS2,

and

VM/370,

each

of

which

is

designated

as

system

control

programming

(SCP).

All

of

these

operating

systems

support

a

virtual

storage

environment

using

dynamic

address

translation,

which

operates

only

when

the

system

is

in

EC

mode.

VM/370

supports

a

virtual

machine

environment.

User-written

processing

programs

that

operate

on

a

Model

145

in

BC

mode,

under

DOS

Version

3

or

4,

OS

MFT,

or

OS

MVT,

can

be

used

with

DOS/VS,

OS/VS1,

or

OS/VS2,

respectively,

with

little

or

no

modification,

as

discussed

in

the

optional

programming

systems

supplements

(Sections

80

to

100).

Hence,

compatible

growth

from

a

System/360

or

a

BC

mode

nonvirtual

storage

environment

to

an

EC

mode

virtual

storage

environment

is

provided.

SYSTEM

TECHNOLOGY

The

Model

145

uses

monolithic

system

technology

(MST)

for

logic

circuitry,

as

do

other

System/310

models.

In

addition,

the

Model

145

embodies

a

significant

technological

advance

in

the

area

of

system

storage

implementation.

That

is,

processor

storage,

as

well

as

control

and

local

storage,

is

implemented

using

monolithic

technology

instead

of

wired,

discrete

ferrite

cores.

The

Model

145

is

the

first

IBM

system

to

use

monolithic

storage

exclusively.

Monolithic

storage

is

similar

in

design

to

monolithic

logic

circuitry,

the

latter

representing

a

technological

advance

over

the

solid

logic

technology

(SLT)

introduced

with

the

announcement

of

System/360.

Since

the

technology

associated

with

monolithic

storage

is

like

that

used

to

produce

monolithic

logic,

monolithic

storage

can

be

batch-fabricated.

10

A

Guide

to

the

IBM

System/310

Model

145

IBM System/370 145 User manual

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