Ibm 3741 data station User manual

Systems

GA21·9183·4

IBM

3741

Data

Station

Reference

Manual

Fifth Edition (November 1977)

This

is

a

major

revision of,

and

obsoletes, GA21-9183-3. Changes are indicated by a

vertical line

at

the

left

of

the

change; new

or

extensively revised illustrations are

denoted

by

a

bullet

(e)

at

the

left

of

the

figure

caption.

Changes are periodically

made

to

the

information

in

this manual and will be

reported

in

subsequent

revisions

or

technical newsletters.

Requests

for

copies

of

I

BM

publications should

be

made

to

your

I

BM

representative

or

to

the

IBM

branch office serving

your

locality.

A Reader's

Comment

Form

is

at

the

back

of

this publication.

If

the

form has been

removed, address

your

comments

to

I

BM

Corporation, Publications,

Department

245,

Rochester, Minnesota

55901.

Comments

become

the

property

of

IBM.

©Copyright

International Business Machines Corporation

1973,

1974,

1975,

1976,

1977

This

publication

is

a reference manual

that

provides

specific

information

about

the

IBM

3741

Data

Station.

This

publication

is

intended

for installation

sup~rvisors,

application personnel, system analysts,

and

system

engineers

who

wish specific

information

on

the

pro-

gramming for

and

operational

considerations

of

the

IBM

3741

Data

Station.

The

IBM

3741

Data

Station

is

part

of

the

IBM

3740

Data

Entry

System.

The

3741

Data

Station

consists

of

two

mod-

els (Models 1

and

2).

The

only

difference

between

Model 1

and

Model 2

is

the

addition

of

binary

synchronous

commu-

nications capabilities

on

Model 2.

Like

the

3741

Data

Station,

the

IBM

3741

Programmable

Work

Station

is

part

of

the

IBM

3740 Data

Entry

System.

The

3741

Programmable Work

Station

consists

of

two

mod-

els (Models 3

and

4).

The

3741

Programmable Work

Station

functions

as a

3741

Data

Station

unless

the

3741 Program-

mable Work

Station

is

under

control

of

an ACL program.

This

publication

provides

information

about

the

3741

Pro-

grammable Work

Station

only

when it

functions

as a

3741

Data

Station.

In

this

publication,

references made

to

the

3741

Data Sta-

tion

Models 1

or

2 apply (respectively)

to

the

3741

Program-

mable Work

Station

Model 3

or

4 (when Models 3

and

4 are

not

under

control

of

an ACL program).

For

information

about

the

3741

Programmable Work

Station

when it

is

un-

der

control

of

an ACL program, see

IBM

3741

Models 3

and4 Programmable Work Station General Information,

GA21-9196,

or

IBM

3741

Models 3

and

4 Programmable

Work Station Programming Reference Manual, GA21-9194.

This

publication

is

divided

into

the

following chapters.

and

a~pendixes:

• Chapter

1.

IBM

3741

Data Station provides an over-

view

of

the

3741.

• Chapter 2. Operation Modes and Considerations pro-

vides

information

about

buffers, modes

of

operation,

and related considerations

concerning

the

3741.

• Chapter 3. Program Information provides

information

on

program coding, program chaining,

and

operator

guidance.

Preface

• Chapter 4. Production Statistics provides

information

on

the

production

statistic

counters,

and

the

display-

ing

of

the

counters.

• Chapter 5. Online Field Totals

and

Chapter

6.

Offline

Field

Totals provide

information

on

online

and offlfne field

totals

capabilities.

• Chapter

7.

Second Disk provides

information

on

second

disk search,

and

copy

operations

when

the

second disk

is

added

to

the

3741.

• Chapter 8

..

Disk Initialization provides

information

on

how

to

initialize

or

check

a diskette.

• Chapter 9

..

"Self-Check Feature provides

information

about

self-checking

when

using

modulus

10

or

modulus 11.

• Chapter

10.

Communications provides

information

on

the

binary

synchronous

communications

feature

of

the

3741.

• Chapter 11.

IBM

3713,

IBM

3715,

and

IBM

3717

Printers

provides

information

on

how

the

3713, 3715,

and

3717

Printers are used

when

attached

to

the

3741.

• Chapter

12.

Proof

Keyboard Feature provides informa-

tion

about

the

numeric

key

rearrangement

for

the

proof

keyboard.

• Chapter 13. Data RecorderAttachment Feature pro-

vides

information

on

how

the

129 Card

Data

Recorder

and

5496

Data

Recorder are used

when

attached

to

a

3741.

• Chapter 14.

I/O

Adapter provides

information

on

how

the

3741

can

transfer

data

directly

to

or

from

a system.

• Appendix A. Timings provides

information

on

timing

for

searches, offline field

totals,

copies,

and

disk initial-

ization

operations.

•

Appendix

B.

Card Punch to Hexadecimal Conversion.

iii

This

publication

assumes

that

the

reader

is

familiar

with

data

entry

techniques

and

is

also familiar

with

the

con-

tents

of

the

following

manuals:

•

IBM

3740

Data

Entry

System

System Summary

and

Installation Planning, GA21.-9152.

•

IBM

3741 Data Station Operator's Guide, GA21-9131.

•

The

IBM

Diskette General

Information

Manual,

GA21-9182.

•

IBM

3742

Dual

Data Station Reference Manual,

GA21-9184.

iv

Contents

CHAPTER 1.

IBM

3741

DATA

STATION

• CHAPTER 4. PRODUCTION STATISTICS

34

IBM

3741 Data Station

Overview.

Counters.

34

Keyboard 2 Keystroke Counter .

34

Display 2 Record

Counter.

34

Diskette

Unit

3

Verify

Correction Keystroke Counter

34

Standard Functions and Available Features 4 Displaying Production Statistics

34

Track

to

Record Conversion Table 35

CHAPTER 2. OPERATION MODES

AND

CONSIDE

RATIONS

5 CHAPTER 5.

ONLINE

FIELD

TOTALS

36

Buffers 5 Online Field Totals

Operation.

36

Current Record

Buffer

5 Displaying Field

Totals.

36

Previous Record

Buffer.

5 Programming Online Field

Total

Fields

36

Hold

Buffer

• 5 Accumulate Totals Fields 37

Program

Buffers.

5 Read Out/Reset Field

Total

Fields 37

Power On

Information

5 Online Field

Total

Restrictions

38

Modes

of

Operation.

6

Example.

38

Read Index Mode (X) 6

Auto

Balance Example • 39

Index

Track

Data

Set

Labels 8

Data Set Label Error Checking

11

CHAPTER 6.

OFFLINE

FIELD

TOTALS

40

Modify

Index Mode (M)

11

Offline

Field Totals Operation

40

Enter Mode (E) 12 Displaying

Offline

Field

Total

Accumulators 40

Update Mode (U) 13 Programming

Offline

Field

Total

Fields •

41

Verify

Mode (V) 13 Accumulate Totals Fields

41

Field Correct Mode

(C)

.

15

Read

Out

Field Totals Fields

41

Search Mode

(S)

• 15

Read

Out/Reset Field Totals Fields

41

Field Totals Mode (F) 18 Control

Statements.

42

Hexadecimal Data

18

Control Statement Format Character Description 43

Multipunch

Operations.

19 Examples. 45

Hexadecimal Display 19 Unconditional Program

Buffer

Selection.

46

Deleted Records. 19

Offline

Field Totals Example 46

Mode Considerations

for

Deleted Records

20

Program

Buffer

5 47

Record Insert Feature

20

Program

Buffer

6 47

Record Insert Mode Characteristics

21

Program

Buffer

7 47

Adding Records

to

a Batch 22

Offline

Field Totals Setup Example 47

Data Recovery 22

Bad

Spots on Disk 23 CHAPTER 7. SECOND

DISK

49

No Record Found (2) Error 23 Dual Disk Operation on the 3741 • 49

Seek

(3)

Error

23 Search Operations

on

the Second Disk 49

Disk Read (4)

Error.

23 Copy . 50

Disk Write (5) Error

24

Copy

All

(Image Copy)

or

Part

of

Disk 2 50

CE

Mode.

24

Copy

All

(Image Copy)

or

Part

of

a Data Set 50

Copy Up

to

a Specified Record on Disk 2 50

CHAPTER 3. PROGRAM

INFORMATION

25 Copying a Record

50

Program Coding • 25

Program Field Descriptions 25 CHAPTER 8.

DISK

INITIALIZATION.

51

Creating and Storing Programs 28 Initialization Procedure 52

Displaying Programs

30

Disk Checking 53

Changing a Program

in

a Program

Buffer.

30

Program Chaining

30

CHAPTER 9. SELF-CHECK

FEATURE

55

Program Chaining Example

31

Computing the Self-Check

Digit

55

Operator Guidance •

31

Modulus

10

55

Prompting Messages.

32

Modulus

11

56

)

I

v

CHAPTER

10.

COMMUNICATIONS

Networks.

Features .

Synchronous Clock .

Terminal

Identification.

Operator

Identification

Card Reader

Keylock

.

Expanded Communciations Feature

Expanded

Communications/Multipoint

Data

Link

Control

Feature

Programming

Support

Communication

Modes.

Transmit

Mode (T) .

Expanded Communications

Transmit

Mode (J)

Transmit-Transparent Mode

(P)

Transmit

Mode Examples . .

Receive Mode

(R)/Expanded

Communications Receive

Receive Mode

Example.

Transmit/Receive Mode (B)

Expanded Communications Transmit/Receive

Mode

(K)

Transmit-Transparent/Receive Mode (D) .

Writing

of

Received Data Over Previously

Transmitted

Data .

Transmit/Receive Mode Examples

Inquiry

Mode (I)

Binary

Synchronous Communications Summary

Operating Procedures

Line

Termination

and

Error

Conditions

Termination

of

the Data Call .

Inquiry

Mode

Termination.

BSCA

Error

Conditions

and Indications

BSCA Disk Errors

Track

and Sector Indicators

Status

Message

Format

.

BSC

CE

Status

Line.

Error

Recovery Procedures

COMMUNICATIONS

THROUGHPUT

CHAPTER

11.

IBM

3713,

IBM

3715,

AND

IBM

3717

PRINTERS

•

IBM

3713 Printer

IBM

3713 Adjustable Margins Feature

IBM

3713 Forms Stand Feature

57

59

61

62

63

66

68

69

70

71

72

74

76

77

80

81

82

89

90

91

92

94

95

IBM

3715 Printer 96

IBM

3715 Forms Stand Feature 96

IBM

3717 Printer 97

IBM

3717 Forms Stand Feature • 97

Functions

97

Printer

Modes 97

Printer

Formatting

98

Local

Format

Control

99

Horizontal

Tab

and Vertical

Skip

Stop Characters 102

Local

Format

Control

Example 104

Processing

Unit

Format

Control

107

Printer

Error

Conditions

110

U

Error

(Printer) 110

W

Error

(Printer

Format) 110

Editing

on

the

3715 and 3717 •

111

Editing

Consideration

111

Editing

Example 114

vi

CHAPTER

12. PROOF

KEYBOARD

FEATURE.

CHAPTER

13.

DATA

RECORDER

ATTACHMENT

FEATURE

Punch Operations

Punch Modes

Read Operations

Read

Modes.

Format

Current Record

Buffer

Card Read/Punch

Format

Control

Program Level A

Card Read/Punch

Format

Control

Programs.

Card Read/Punch

Format

Instruction

Set

Function

Switches .

How

Format

Control

Works

Format

Control

Examples

CHAPTER

14.

I/O

ADAPTER

File

Transfer.

Mode 1

Mode 2

Mode 3

Mode 4

Mode 5

..

Summary

of

File

Transfer Operations (Read

or

Write)

Error

Recovery Procedures

Disk Errors .

System Channel

Errors.

APPENDIX

A.

TIMINGS

•

APPENDIX

B.

CARD

PUNCH

TO

HEXADECIMAL

CONVE

RSI ON •

CARD

PUNCH

TO

HEX

CONVERSION

(IN

HEXADECIMAL

ORDER)

CARD

PUNCH

TO

HEX

CONVERSION

(IN

CARD

PUNCH

ORDER)

GLOSSARY.

INDEX

116

117

118

119

120

121

122

123

124

130

131

132

133

134

135

136

137

138

140

)

IBM

3741 DATA STATION OVERVIEW

The

IBM

3741 Data

Station

is

part

of

the

3740

Data

Entry

System.

The

tBM 3741 Data

Station

is

a key

entry

device

used

to

record data

on

a data recording

medium

called

the

I

BM

diskette.

Model 1 (Figure

1)

is

a

standalone

device which has

one

keyboard

unit,

one display unit, one

or

two

diskette

units,

and

a

control

unit. Model 2

(not

pictured)

is

the

same as

Model 1, with

the

addition

of

a binary

synchronous

com-

munications adapter.

Once

data

has been recorded

on

the

diskette

by

the

3741,

the

data

can be

transmitted

to

another

location

through

the

use

of

binary synchronous

communications.

For Model 2

only,

or

for

Models 1 and 2,

the

data

can be:

• Converted

to

tape

by using

the

IBM

3747

Data Converter

Display Unit

Control Unit

Figure 1.

IBM

3741 Data

Station

Chapter 1.

IBM

3741 Data

Statio~

• Processed by

the

3741 Programmable Work

Station

Mod-

els 3

or

4

• Used with

the

IBM

3540

Diskette

Input/Output

Unit

which provides direct

input

capabilities

to

a

System/370

• Printed by

the

3713,

3715,

or

the

3717

Printer

Note:

The

3741 Programmable Work

Station,

Models 3 and

4, operates as a 3741 Data

Station,

unless

the

Programmable

Work

Station

is

under

Application

Control

Language (ACL)

program

control.

When operating as a

Data

Station,

the

Model 3 has

the

same

functions

and

available features as

the

Model 1;

and

the

Model 4 has

the

same

functions

and

avail-

able features as

the

Model 2. See

IBM

3741 Models 3 and

4 Programmable Work Station Programming Reference

Manual, GA21-9194, for

information

on

the

3741 Program-

mable Work

Station,

under ACL program

control.

Diskette Unit

No.2

Diskette Unit

No.1

Keyboard Unit

IBM

3741 Data

Station

Keyboard

The

keyboard

(Figure

2)

consists

of

data

keys, special

function

keys,

function

select keys,

two

rows of labels,

and switches. Data keys provide

the

means

of

keying

64

different

displayable characters.

All

256

EBCDIC

codes can be keyed with

the

use

of

the

HEX key.

The

function

select keys are used

to

redefine

the

top

row

of

keys as indicated by

the

two

rows

of

labels above

the

top

row

of

keys.

The

lefthand

function

select key, lettered

in

green,

is

associated with

the

upper

row

of

labels

(that

Figure

2.

3741 Keyboard (Model 1)

Display

The

display (Figure 3) provides

station

status

information,

program

information,

and

data

on

the

screen.

The

3741

Data

Station

uses six 40-character lines

of

the

display

screen. Line 1 indicates

station

status. Lines 2, 3, 4,

and

the

first eight positions (total

of

128

positions)

of

line 5

display

either

data

or

program information, depending

upon

the

display

mode

selected. The last

30

positions

of

line 5

and

6 are used

for

the

operator

guidance feature. A cursor

(underscore)

is

used

to

indicate

the

position

of

the

to

be

entered.

A

complete

description

of

the

display

is

provided

in

the

IBM 3741 Data Station Operator's Guide, GA21-9131.

2

is,

redefines

the

top

row

of

keys according

to

the

top

row

of

labels), which are also green.

The

righthand

function

select key,

lettered

in white,

is

associated with

the

lower

row

of

labels.

The

special keys (DUP,

FI

ELD BKSP, REC

ADV, RESET, etc.) perform specific

functions

during

data

entry.

The

switches provide

automatic

skip/duplicate,

automatic

record advance, and program numeric shift

functions.

For

a

complete

description

of

the

keyboard's

keys

and

switches, see

the

IBM 3741 Data Station Operator's

Guide, GA21-9131.

Status Line Cursor

3 A A

01001

ER

ADDRESS

112

MAIN

STIIIIIIIIIIIIIIIIIII

Guidance Message

Figure

3.

Display

Unit

with

Operator

Guidance

(

)

Diskette

Unit

The

disk

unit

reads

and

writes

on

one

side

of

the

diskette.

Figure 4 shows

the

I

BM

diskette.

For

a

complete

descrip-

tion

of

the

I

BM

diskette,

its

layout,

care,

storage,

and

han-

dling, see

The

IBM

Diskette General Information Manual,

GA21-9182.

Figure 4. IBM

Diskette

IBM

3741 Data

Station

3

STANDARD

FUNCTIONS

AND

AVAILABLE

FEATURES

Figure 5

shows

the

standard

functions

and

available

features

for

the

3741.

IBM

3741

Data

Station

(Models 1

and

2)

and

IBM

Standard

Function

3741

Programmable

Work

or

Feature

Station*

(Models 3

and

4)

Communications

Standard

on

the

3741

Model 2

or

4;

not

available

on

Model

1 or 3

Expanded

Feature

on

Model 2

communications

or

4

Entering

and

updating

Standard

records

Operator

guidance

Standard

Program

chaining

Standard

Record

length

of

1

Standard

to

128

characters

Search

on

content

Standard

Search

on

end

of

data

Standard

Search

on

record address

Standard

Search

on

sequential

Standard

content

Ten levels

of

program

Standard

control

Data

recorde

r

attach

ment

Feature

Disk

copy

Standard

on

second

disk

Keylock

Feature

on

Model 2

or

4

Operator

identification

Feature

on

Model 2

or

4

card

reader

Proof

keyboard

Feature

Record

insert

Feature

*Not

under

ACL

program

control.

Figure 5 (Part 1

of

2).

Standard

Functions

and

Available Features

4

IBM

3741

Data

Station

(Models 1

and

2)

and

IBM

Standard

Function

3741

Programmable

Work

or

Feature

Station*

(Models 3

and

4)

Second

disk

Feature

Synchronous

clock

Feature

on

Model 2

or

4

Terminal

identification

Feature

on

Model 2

or

4

1200

bps

integrated

modem

Nonswitched

Feature

Switched

with

auto

Feature

answer

3713

Printer

Feature

3715

Printer

Feature

3717

Printer

Feature

group

A:

Feature

Disk

initialization

Offline field

totals

Online field

totals

Production

statistics

Self-check

number

(modulus

10

and

modulus

11)

Verify

*Not

under

ACL

program

control

Figure 5 (Part 2

of

2).

Standard

Functions

and

Available Features

)

Entering,

updating,

verifying

or

searching

of

data

on

a

disk

is

performed

by

the

data

stations

using

different

modes

of

operation.

The

sequence

of

operations

per-

formed

by

the

control

unit

within

the

data

station

is

directly

dependent

upon

the

mode

in

which

the

station

is

operating.

Each

mode

of

operation

is

unique,

and,

there-

fore,

the

use

of

buffers,

keys,

and

information

displayed

is

different

in

each

mode.

BUFFERS

Buffers

are

temporary

storage

areas used

for

transferring

data

between

the

keyboard,

display,

and

disk.

The

buffers

are

the

current

record

buffer,

hold

buffer,

and

program

buffers.

Current

Record

Buffer

The

current

record

buffer

receives

data

characters

as

they

are

keyed.

Records

read

from

disk

are

also

placed

in

this

buffer.

Data

displayed

on

the

display

screen

is

from

the

current

record

buffer.

Buffer

The

buffer

contains

the

record

that

was

previously

displayed

in

the

current

record

buffer.

Data

is

written

on

the

disk

from

this

buffer.

The

buffer

is

the

buffer

from

which

characters

are

obtained

by

the

control

unit

for

duplicating

into

duplicate

fields

in

the

current

record

buffer.

Hold

Buffer

The

hold

buffer

contains

the

to

be

verified

when

in

verify

mode.

This

buffer

contains

the

search

mask

during

search

on

content

or

search

on

sequential

content

operati

ons.

Chapter 2.

Operation

Modes

and

Considerations

Program

Buffers

The

3741 has 10

program

buffers

numbered

1

through

9

and A.

The

program

buffers

usually

contain

programs

that

control

record

format

and

processing.

For

offline

field

totals

operations,

the

program

buffers

will also

contain

some

field

totals

control

statements

that

are

required

in

order

to

perform

the

field

totals

operations.

See Chapter 6.

Offline

Field Totals

for

more

information.

Program

buffers

are

also

used

to

contain

operator

guidance

prompting

message

records.

For

information

on

operator

guidance,

see Operator Guidance

in

Chapter 3. Program

Information.

POWER ON

INFORMATION

When

the

3741

is

turned

on,

the

current

record,

and

hold

buffers

are filled

with

blanks,

and

the

program

buffers

are filled

with

N's.

Program

buffer

0

is

selected.

The

status

Iine displays

the

machine-not-ready

disk

status

(N),

the

read

index

mode

(X),

program

level 0,

and

current

disk

address

00000. All

other

positions

on

the

status

line

are

blank.

Closing

the

cover

on

the

diskette

that

has

been

inserted

changes

the

machine

status

to

wait

(W).

The

volume

label

is

read

but

not

displayed,

and

the

accessibility field in

the

volume

label

is

checked.

The

accessibil

ity

field

is

used

to

allow

(field

is

blank)

or

inhibit

(field

contains

any

char-

acter)

use

of

a disk. If

the

accessibility field

is

not

blank,

the

disk

cannot

be

processed

and

an

A

error

is

displayed.

Then

the

3741

waits

for

the

diskette

to

be

removed.

A

write

test

is

made;

if

not

successful, ??

is

displayed

in

positions

9

and

10

of

the

status

line.

If??

is

displayed,

other

disks

should

be

inserted

to

see if

the??

disappears.

If

the??

continues

to

be

displayed,

call I

BM

for

service

since

the

machine

cannot

write

records

on

disk.

If

all

tests

are

successful,

sector

08

is

read

and

displayed.

Sector

08

contains

the

first

data

set

label (a

data

set

label

defines

required

information

about

a

data

set.

See

Index Track Data Set Labels in

this

chapter

for

more

information).

Data

entry

or

other

data

station

operations

can

now

be

performed.

Operation Modes and Considerations 5

.MODES

OF

OPERATION

The

mode

of

operation

is

indicated

by a

code

displayed in

position

38

of

the

status

line

of

the

display

unit.

Some

of

the

modes

of

operation

for

the

3741

and

their

correspond-

ing display

codes

are:

Mode Display Code

Read index X

Modify index M

Enter

E

Update

U

Verify V

Field

correct

C

Search S

Field

totals

F

Read

Index

Mode (X)

The

3741

is

in read

index

mode

whenever

it

is

on

the

index

track.

The

read

index

mode

allows records

on

the

index

track

representing

the

volume

label,

the

data

set

labels,

and

other

system

data

to

be

displayed

on

the

display screen.

These

records

can

also

be

modified

or

deleted

by

a special

procedure

called

modify

index. See

Modify

Index Mode

(M)

in this

section

for

further

information.

Figure 6

shows

the

data

flow

for

read

index

mode.

6

I

ndex

record

is

read

from

disk

into

the

....

4f-------

current

record

buffer

and

displayed.

DI,-_~

•

o

Disk

J]

Display

Record advance

transfers

the

record

to

previous record

buffer.

Figure 6. Data Flow

for

Read

Index

Mode

(

Index Track

Layout

The

first

track

on

a disk

is

called

the

index track

and

is

numbered

00.

The

index

track's

26

sectors are for system

or

data

set

label

information.

The

26

sectors

on

each

of

the

remaining tracks,

numbered

01

through

73,

are used for

data.

Each sector can

contain

one

record.

Track

74

is

reserved

and

should

not

be

used

for

data

entry.

Each record

on

the

index

track

has a

record

length

of

80

characters.

The

index

track

layout

is

shown

in Figure 7.

Sector

Contents

Sector

1

80

blanks

Sector

2

80

blanks

Sector

3 Position 1: machine

test

character

for a write

test

Sector

4

80

blanks

Sector

5 Positions 1-5: ERMAP; positions 6-80: blanks

The

first seven sectors

of

the

index

track

may

contain

system

information

or

information

about

the

diskette,

such as

the

location

of

tracks

that

have developed errors

in use. These seven sectors are

not

usually used

or

modi-

fied by

the

operator.

The

remaining sectors (08-26)

may

contain

data

set

labels, which are used

to

define

the

data

sets resident

on

the

disk.

If

the

disk has 1

or

2

bad

tracks, positions 7 and 8 indicate

the

first

bad

track

and position 9

contains

a

0;

positions

11

and

12

indicate

the

second bad

track

and

position

13

contains

a

O.

Sector

6

80

blanks

Sector

7 Volume label:

positions

Sectors

8-26

1 2 3 4

VOL

1

Data

set

labels

5 6 7 8 9

10

11

12

______________

76

kS-------

_____

16

~

)

~

Volume

ID*

Accessibility -

Any non-blank

character

means

disk

is

not

accessible

12

through

76

contains

blanks

77 78

79

80

~

W

Sector

sequence

information

*The

volume

ID

field

contains

IBMIRD

when

the

diskette

is

received

from

IBM. When

you

initialize

the

diskette,

the

volume

10

field

contains

either

the

volume

10

entered

by

the

operator

or

is

blank

if

the

operator

did

not

enter

a

volume

10.

Figure 7.

Index

Track

Layout

Operation

Modes

and

Considerations

7

Index

Track

Data

Set

Labels

Sectors

8

through

26

of

the

index track are used primarily

for

data

set

labels. A

data

set

label defines required infor-

mation

about

a

data

set

on disk such

as

beginning

of

ex-

tent

(BOE),

end

of

data

(EOD), end

of

extent

(EOE),

and

the

record length

of

records for

the

data

set.

Data

Set

Label Field Description

Figure 8 shows

the

field

layout

of

a

data

set

label.

The

following

is

a

description

of

each

of

the fields in

the

data

set label.

Header 1 Field (Positions 1-4):

The

header

1 field, a

re-

quired field,

is

a

data

set

label identifier

for

system

application.

It

must

be HDR1 in

order

to

be a valid

data

set label identifier. When a disk

is

initialized,

only

sector

8

of

the

index

track

has HDR1. Sectors

9-26

contain

DDR1

in

positions 1

through

4

and

are deleted.

The

deleted

label identifier can be modified

to

a valid

data

set

label identifier (HDR

1)

by using

the

modify

index

mode. Modifying

the

label

in

this way allows

you

to

de-

fine

more

data

sets

on

one

disk.

Data

Set

Name Field (Positions 6-13):

The

data

set

name

field, an

optional

field,

is

provided

to

allow

you

to

give

the

data

set

a descriptive name. When a disk

is

initialized,

the

data

set

name

field

of

the

data

set

label in

sector

08

contains

DATA

as a name.

The

data

set

name field

of

the

data

set

labels in

sectors

09

through

26

contains

DATA

09

through

DATA

26, respectively.

The

data

set

name

can

be changed

to

a descriptive

data

set

name by using

the

modify

index mode.

Record Length Field (Positions 23-27):

The

record length

field, a required field,

must

contain

the

logical record length

for

the

records

to

be placed

in

the

data

set. Disk initializa-

tion

places

the

record length

into

this field

for

you.

For

the

3741,

the

record length field can be

00001

through

00128.

Disk initialization

can

be used

to

set

the

record

length

to

t6t6

128.

The

modify

index

mode

can

be

used

to

change

the

128

to

any

value

from

1

through

128.

Beginning

of

Extent

Field (Positions 29-33):

The

beginning

of

extent

(BOE) field, a required field, identi-

fies

the

address

of

the

first

sector

of

the

data

set

(where

the

first record

of

the

data

set

will be).

The

BOE field

has

th

is

format:

TTOSS where

IT

is

the

track

number

and

SS

is

the

sector

number.

The

track

number

must

be

in

positions

29

and

30,

a 0

must

always be

in

posi-

tion

31,

and

the

sector

number

must

be in

positions

32

and

33.

The

BOE address

must

be 01001

or

greater.

8

End

of

Extent

Field (Positions 35-39):

The

end

of

extent

(EOE) field, a required field, identifies

the

address

of

the

last

sector

of

the

data

set (where

the

last record

of

the

data

set

will be).

The

EOE field has

the

same

format

as

the

BOE field.

The

track

number

(TT)

must

be in posi-

tions

35

and

36,

a 0

must

always be

in

position

37, and

the

sector

number

(SS)

must

always be

in

positions

38

and

39.

The

EOE address

cannot

be larger

than

74026

or

an

incorrect

data

set

label (B)

error

will occur. How-

ever,

track

74

is

reserved and should

not

be used for

data

entry.

Bypass Data

Set

Field (Position

41):

The

bypass

data

set

field

is

a field

for

use

by

the

3747

or

the

3741

with

the

communications

feature,

data

recorder

attachment

feature,

and I/O

adapter.

This field must

contain

a B

or

be blank.

If

the

field

contains

a

B,

the

3747

bypasses

the

data

set

(the

data

in

the

data

set

is

not

converted

to

tape).

If

the

field

is

blank,

the

data

in

the

data

set

is

converted

to

tape.

This

field allows

you

to

store

programs

and

data

on

the

same

disk. A B

would

be

put

into

the

bypass

data

set

field

of

the

data

set

label describing

the

data

set

containing

the

programs

The

B would keep

the

programs from being

converted

to

tape.

For

the

communications

feature,

the

station

transmitting

will bypass a

data

set

if

the

bypass

data

set field

contains

a

B.

For

a receiving

station,

if

the

bypass

data

set

field

contains

a

B,

the

data

set

defined

by

the

data

set

label

will

not

be bypassed

(data

will be received

and

written

into

the

data

set).

For

the

3540

Diskette

Input/Output

Unit, a B in position

41 causes

the

data

set

to

be bypassed during read opera-

tions.

Accessibility Field (Position

42):

The

accessibility field

is

used

to

control

access

to

a

data

set. If this field

is

blank,

the

data

set

is

processed. If any

character

is

in this field,

the

3741

does

not

allow

the

data

set

to

be processed and

a disk accessibility (A)

error

is

displayed.

For

the

3741,

this field

cannot

be modified.

Write Protect Field (Position

43):

The

write

protect

field

controls

writing

of

records

on

the

disk. If this field

is

blank, records

in

a

data

set

are read from

the

disk

and

records are

written

on

the

disk. If this field

contains

a

P,

the

data

set

is

write

protected

(data

cannot

be

written

on

the

disk),

Interchange Type

Indicator

(Position 44):

The

interchange

type

indicator

field

must

be blank. A blank indicates

the

data

set

can

be used for

data

interchange.

Multivolume Indicator Field (Position 45):

The

multi-

volume

indicator

field

is

used

to

indicate

whether

a

data

set

is

on

one

or

more

diskettes. A

multivolume

data

set

is

a

data

set

that

is

continued

from

one

diskette

to

another.

A

blank

in this field indicates

that

the

data

set

is

contained

on

only

one

diskette.

C

is

placed

in

this field if

the

data

set

is

continued

on

another

diskette.

When a

data

set

is

continued

on

several

diskettes,

this field in

the

data

set

label

of

the

last

diskette

must

contain

an L.

The

L means

that

this

diskette

is

the

last for a

multivolume

data

set.

For

the

3747,

the

L

means

that

the

data

set

ends

with

the

data

associated

with

this

label. A

kS

or

C means

that

the

data

set

is

not

complete

with

this

label.

For

the

data

recorder

attachment

feature

and

the

I/O adap-

ter,

the

multivolume

indicator

field will be

described

in

their

respective

chapters.

Volume Sequence Number Field (Positions 46-47):

The

volume

sequence

number

field, an

optional

field,

is

used

to

specify

the

sequence

of

volumes

in

a

multivolume

data

set

(data

set

is

on

more

than

one

diskette).

The

sequence

must

be consecutive, beginning

with

01

(to

a

maximum

of

99),

if used. If a

diskette

will be used

on

the

3540,

this

field

is

required.

Creation Date Field (Positions 48-53):

The

creation

date

field, an

optional

field,

is

used

to

record

the

date

the

data

set

was

created.

The

format

of

the

creation

date

can

be

YYMMDD,

where

YY

is

the

year,

MM

is

the

month,

and

DD

is

the

day.

An

example

is:

770704.

This

is

July

4,

1977.

If

a

diskette

will be used

on

the

3540,

this

field

is

required.

Expiration Date Field (Positions 67-72):

The

expiration

date

field. an

optional

field,

is

used

to

record

the

date

the

data

set

expires.

The

format

of

the

expiration

date

is

the

same as

for

the

creation

date.

If a

diskette

will be

used

on

the

3540,

this

field

is

required.

Verify Indicator Field (Position 73):

The

verify

indicator

field

is

used by

the

3741

to

indicate

that

a

data

set

has

been verified by placing a V

into

this field

when

the

last

record of a

data

set

has been verified.

This

field

is

blank

until

the

data

set

has

been verified. If a

data

set

was

verified and

then

a

change

made

to

the

data

set

(either

in

enter

or

update

mode),

the

3741 replaces

the

V

with

a

blank.

End

of

Data Field (Positions 75-79):

The

end

of

data

(EOD) field, a

required

field,

contains

the

address

of

the

following

the

last

data

record

in

the

data

set

(the

EOD address).

The

address

of

the

last

data

record

in

a

data

set

is

EOD

minus

one. When

creating

a

data

set

label,

the

EOD address

must

be equal

to

the

BOE

address.

The

EOD address

is

automatically

updated

by

one

each

time

a record advance

occurs

in

enter

mode.

In

this

manner,

the

3741

keeps

track

of

the

location

on

disk

where

the

can

be

written.

When

the

operator

completes

entering

records

and

performs

the

return

to

index

function,

the

EOD value in

the

data

set

label

is

modified

to

the

updated

EOD value.

Position

by

Position

Representation

of

Data

on

the

Index

Track

in

AnyOne

Sector

of

8-26. I

Field Name Position Purpose

Header 1 1-4* Label

identifier

for

system

application;

must

be

HDR1.

5 Reserved.

Data

set

name

6-13 Descriptive

name

for

data

set.

14-22 Reserved.

Record length

23-27*

Logical

record

length.

28

Reserved.

Beginning

of

29-33*

Identifies

the

address

of

the

first

sector

of

the

data

set.

extent

(BO

E)

34

Reserved.

*Indicates this

entry

is

required by

the

3740

Data

Entry

System.

Figure 8

(Part

1

of

2). Data

Set

Label

Layout

I

Operation Modes

and

Considerations 9

Field

Name

End

of

extent

(EOE)

Bypass

data

set

indicator

Accessibil ity

Write

protect

Interchange

type

indicator

Multivolume

indicator

Volume

sequence

number

Creation

date

Expiration

date

Verify

indicator

End

of

data

(EGO)

Position

35-39*

40

41

42

43

44

45

46-47

48-53

54-66

67-72

73

74

75-79*

80

Purpose

Identifies

the

address

of

the

last

sector

reserved

for

th

is

data

set.

Reserved.

The

IBM

3747

data

converter

and

the

3741

communication

feature

require

that

this

field

contain

a B

or

a

blank.

If a B

is

present,

the

data

set

is

ignored.

If a

blank

is

present,

the

data

set

is

processed.

This

coding

allows

the

user

to

store

programs

and

data

on

the

same

disk.

This field

must

contain

a

blank

in

order

for

processing

to

take

place.

If

this

field

contains

a P,

the

data

set

can

be

read

only.

This

field

must

con-

tain

a

blank

to

allow

both

reading

and

writing

Must

be

blank.

A blank

indicates

the

data

set

can

be

used

for

data

inter-

change.

A

blank

in

this

field

indicates

a

data

set

contained

on

one

diskette;

a C in-

dicates

a

data

set

is

continued

on

another

diskette;

an L

indicates

the

last

diskette

on

which

a

continued

data

set

resides.

Volume

sequence

number

specifies

the

sequence

of

volumes

in a multi-

volume

data

set.

The

sequence

must

be

consecutive,

beginning

with

01

(to

a

maximum

of

99),

if

used.

May

be

used

to

record

the

date

the

data

set

was

created.

The

format

of

the

creation

date

is

YYMMOO,

where

YY

is

the

year,

MM

is

the

month,

and

DO

is

the

day.

Reserved.

May

be

used

to

contain

the

date

that

the

data

set

expires.

The

format

of

the

expiration

date

is

the

same as

for

the

creation

date.

This

field

must

contain

a V

or

a

blank.

V

indicates

the

data

set

has

been

verified.

Reserved.

Identifies

the

address

of

the

sector.

Reserved.

*Indicates this

entry

is

required by

the

3740

Data

Entry

System.

Figure 8 (Part 2

of

2). Data

Set

Label Layout

10

\ )

/

Data

Set

Label Error Checking

The

3741 checks

to

see if any

of

the

following

error

condi-

tions

exist

in

the

data

set label:

1.

The

beginning of

extent

address

is

less

than

track

01,

sector

01.

2.

The

end

of

extent

address

is

greater

than

track

74,

sector

26_

3.

4.

5.

6.

7_

The

end

of

extent

address

is

less

than

the

beginning

of

extent

address.

The

end

of

data

address

is

greater

than

the

end

of

extent

address plus

1.

The

end

of

data

address

is

greater

than

track

75,

sector

01.

The

sector

is

00

or

greater

than

26.

The

record length

is

equal

to

0

or

greater

than

128

for

the

3741.

8.

The

third

character

of

the

record address

of

begin-

ning

of

extent,

end

of

extent,

or

end

of

data

is

other

than

O.

9.

The

last record read

and

currently

displayed

is

from

track

00, sectors 1 through 7.

10. The

fourth

position

of

the

header 1 field

is

a

number

other

than

one.

11.

The

record has been deleted_

When a

header

1 record in sectors

08

through

26

is

read,

the

3741

checks

the

first eight

conditions

in

the

If

any

of

these

conditions

exist, an

incorrect

data

set

label (8)

error

is

displayed.

When

update,

verify,

enter,

or search

mode

is

attempted

from

the

index

track,

all

11

conditions

are

checked.

If

anyone

of

the

11

conditions

is

present,

the

incorrect

data

set

label (8)

error

is

displayed.

Multiple Data Sets Per Disk

For

ease

of

processing,

one

data

set

per disk

is

the

best.

However,

more

than

one

data

set

can be

on

one

disk. Each

data

set

is

identified

by

its respective

data

set

label

on

the

index

track.

Each

data

set

label identifies a

data

set as

to

its beginning

and

ending addresses,

whether

the

data

set

has been verified,

the

record

length,

the

name

of

the

data

set

(optional field)

and

other

information

about

the

data

set. When a

diskette

is

inserted

into

the

disk drive, .

the

data

set

label

at

sector

08

on

the

index

track

is

always

displayed first. If

there

are

other

defined

data

set

labels

on

the

index

track,

the

operator

can record advance until

the

appropriate

data

set label

is

found_

To

aid

the

operator

in

reviewing and finding

the

desired

data

set

label,

the

data

set

name field (positions 6-13) in

the

data

set

label

should be used. In

addition,

the

data

set

label

creation

date

field and

the

data

set

expiration

date

field

should

also

be used

when

a clear

distinction

between

jobs

is

needed

to

ensure

the

selection

of

the

correct

data

set.

Then

in addi-

tion

to

reading

the

data

set name,

the

operator

could

also

check

the

creation

and

expiration

dates

to

ensure

proces-

sing

of

the

right

data

set,

or

the

right version

of

the

data

set.

Modify

Index

Mode

(M)

The

modify index

mode

is

used

to

modify

records

on

the

index

track.

Fields

in

a

data

set

label, new

data

set labels,

the

volume label,

or

other

records

on

the

index

track

can

be modified

by

using

the

modify

index

mode.

Any

of

the

records can also be

deleted

with

the

use

of

the

modify

index

mode

function_

To

perform

a

modify

index

function,

record backspace

or

record advance

to

get

to

the

appropriate

index

track

record

to

be modified, key

the

record

to

be

written,

then

select

modify

by

pressing. FUNCT

SEL

lower and

M.

The

modify

mode

can

be

selected

from

the

read

index

mode

.only;

if it

is

selected from

another

mode,

a

mode

selection

(M)

error

occurs. No

other

mode

can

be

selected

from

the·

modify

mode.

DELET~

REC, RESET,

and

REC ADV

are

the

only

valid keys

in

the

modify

mode.

All

others

give a

function

not

available (F)

error.

The

mode

reverts

to

read index

after

the

first

keystroke

following

the

selection

of

modify

mode.

Operation Modes and Considerations

11

Enter

Mode

(E)

Enter

mode

is

the

most

basic

mode

of

operation.

Enter

mode

can

be

selected

from

the

index

track

only;

a

mode

selection

(M)

error

results if

enter

mode

is

selected from

any

other

position

on

the

disk.

Enter

mode

is

used

to

write

new

information

on

the

disk.

To

select

the

enter

mode,

press FUNCT

SEL

lower

and

then

press

ENTER.

As

the

operator

keys a

record,

the

data

is

stored

in

the

current

record

buffer

until

the

record

is

completed.

When

a

record

advance occurs,

the

completed

record

is

trans-

ferred

to

the

previous record

buffer.

While

the

is

being

keyed

into

the

current

record

buffer,

the

previous record

is

written

on

the

disk.

The

data

flow

is

summarized

in

Figure

9.

When

enter

mode

is

selected,

the

disk

is

positioned

at

BOE;

the

current

record

buffer

and

the

previous record

buffer

are

set

to

blanks.

The

station

is

then

ready

to

accept

data

keyed

into

the

current

record

buffer.

As

data

is

keyed,

it

is

stored

in

the

current

record

buffer

and

.....

f-----

displayed

on

the

screen. Keyboard

.-At

record

advance,

the

data

is

moved [f

to

the

buffer

and

written

on

the

disk.

The

current

record

is

filled

with

blanks

to

allow

the

operator

to

key

the

record.

•

Figure 9. Data

Flow

for

Enter

Mode

12

Display

01

•

0

Disk

J]

Alternate Record Advance in Enter Mode

An

alternate

method

of

record

advance in

enter'

mode

can

be

selected

by

pressing FUNCT

SEL

lower and

then

R.

A

dash

will

appear

in

position

39

in

the

status

line.

The

record advance

function

in

enter

mode

is

changed so

that

all fields

that

follow

the

position

of

the

cursor

at

the

time

of

record advance are

not

executed

in

contrast

to

these

fields being

executed.in

normal ent'er

mode.

The

alternate

record

advance.function

has

this

.advantage: When

the

REC ADV

key

is

pressed,

the

record

is

always

written

on

the

disk

exactly

as

the

operator.

sees it on.

the

display (no

automatic

duplicate

or

skip

fields are

executed).

The

normal record advance

may

cause changes

in

automatic

duplicate

and skip fields

that

are

beyond.the

cursor

posi-

tion

at

the

time

of

record advance.

To

return

the

machine

to

the

normal

enter

mode,

press

FUNCT

SEL

lower

and

K. Inserting a.disk

or

turning

the

power

on

will also establish

the

normal

mode.

Right Adjust Fields

Programmed right

adjust

fields allow

data

entered

into

the

current

field

to

be moved

to

the

right field

.boundary

by

pressing

the

RIGHT

ADJUST

key. Right

adjust

fields

must

be

at

least

two

characters

long

and

can

be as long as a

whole

record.

In

enter

mode,

the

RIGHT

ADJUST

key

is

used

to

exit

a right

adjust

field. When

the

RIGHT

ADJUST

key

is

pressed,

the

3741

shifts

the

characters

previously

entered

in

the

field (up

to

the

cursor

position)

to

the

right field

boundary.

Fill

characters

are

inserted

to

the

left

of

the

first

keyed

character

as required.

The

fill

character

used

depends

on

the

field

definition

character

used

for

the

field.

See Right

Adjust

Fields in

Chapter

3.

Pressing

the

RIGHT

ADJUST

key

in

the

first position

of

a

right

adjust

field

enters

fill

characters

into

the

entire

field.

The

dash

(-)

key,

when

used in a right

adjust

field

that

is

programmed

for

numeric

shift,

gives a negative value

to

the

number

and

then

causes

the

field

to

be

exited.

The

units

(rightmost) position

of

the

negative

number

contains

an

alpha

equivalent

if

the

digit

is

1

through

9 (1=J, 2=K,

3=L,

4=M,

5=N,

6=0,

7=P,

8=0,

9=R)

or

the

hex

code

DO

if

the

digit

is

O.

The

numbers

in

the

other

positions

of

the

right

adjust

field have

their

numeric

value.

For

example,

if

21

is

entered

in a five-position,

zero

fill, right

adjust

field

and

the

dash key

is

pressed,

the

field will

contain

0002J

(negative

21).

Note: Performing a

character

advance

or

field advance

will cause

the

right

adjust

fieJd

to

be

exited

in

enter

mode.

Update

Mode (U)

Use

the

update

mode

to

read

records

from

the

disk

for

review

or

modification.

To

select

the

update

mode,

press

FUNCT

SEL

lower

and

then

press UPDATE.

Data

flow

is

summarized

in Figure

10.

Update

mode

can

be

selected

from

the

read

index,

search,

or

verify

mode.

If

update

is

selected

from

the

index

track,

the

disk

is

posi-

tioned

at

BOE; if

update

is

selected

from

the

verify

mode,

the

record

at

the

current

disk address

is

reread. Selecting

the

update

mode

from

the

enter

mode

results

in

a

mode

selection (M) error. However,

the

mode

automatically

changes

to

the

update

mode

when

record

backspacing

occurs

during

the

enter

mode.

The

search

mode

also

auto-

matically changes

to

update

mode

at

the

end

of

a search

operation.

An

empty

data

set

(Y)

error

occurs

if

update

mode

is selected

when

the

end-of-data

address

equals

the

beginning-of-extent

address;

in

other

words,

when

the

data

set

is

empty.

If record advance reaches EOD

during

update

mode,

the

mode

of

operation

automatically

changes

to

enter

mode.

However,

an

automatic

return

to

index

track

is

performed

if

the

data

set

is

protected

by

a

write

protect

byte

in

the

label (a

write

protect,

G,

error

is

displayed)

or

if

the

data

set

is

full (an

end

of

extent,

E,

error

is

displayed).

DL--I

_-I

•

o

Record

is

read

from

.....

'----

...

-------

disk

into

current

Disk

record

buffer

and

displayed.

Any

changes are

keyed

into

current

record

-----t~

buffer.

~

(

n:

]

ACM[(ORPQRATIOh

l

Display

Record

advance

transfers

data

to

Keyboard

" 1

~

buffer

---------------1

and reads

into

current

record

buffer. If

data

was

changed

the

record

is

written

to

disk.

Figure

10.

Data

Flow

for

Update

Mode

Verify

Mode (V)

Use

the

verify

mode

to

check

the

accuracy

of

data

records

already

on

the

disk and

to

make

corrections

to

the

records

when

errors

are

found.

The

process

of

verifying

data

is

similar

to

that

of

entering

data.

As

the

data

for

a

record

is

rekeyed

from

the

source

document,

each

character

is

automatically

compared

with

the

corresponding

character

in

the

record

in

the

current

record

buffer.

If

the

characters

do

not

compare,

a verify

mismatch

(V)

error

occurs.

To

select

the

verify

mode,

press

FUNCT

SEL

lower

and

then

press

VERI

FY.

Select

the

verify

mode

from

read

index

or

update

mode.

For

data

flow, see Figure

11.

When

verify

mode

is

selected,

the

buffer

is

auto-

matically filled

with

blanks,

and

the

first

non-deleted

record

is

read

into

the

current

record

buffer.

Verify

mode

can also

be

selected

from

verify

mode.

Selecting verify

mode

from

verify

mode

is

provided

in

the

event

that

the

operator

discovers,

after

making

some

cor-

rections

to

the

record

being

displayed,

that

the

wrong

source

record

is

being used

to

verify

the

record

being

displayed.

By selecting verify

mode

from

verify

mode,

all

changes

made

to

the

record

are ignored

and

the

entire

record

is

redisplayed.

is

read

from

disk

into

the

......

f------

hold

buffer.

~

.

The

record

IS

transferred

at

record

advance

to

the

current

____

.~I

record

buffer

and

displayed.

t

Keyed

data

is

com-

pared

with

the

data

in

the

01

____

--'

•

o

Disk

Display

~u:::~;

:~~~~~:uffer.

~

z-w~~<

transfers

data

to

_.

~

buffer.

Data

is

written

on

the

disk

Keyboard

only

if

data

was

-.-;.-----------1

changed.

Figure

11.

Data

Flow

for

Verify

Mode

Operation Modes and Considerations 13

Display

During verification,

the

data

record

is

displayed

up

to

but

not

including

the

cursor

position. However,

the

entire

record

is

displayed (1)

after

the

record

is

moved

into

the

current

record

buffer,

(2)

after

a record backspace opera-

tion,

or

(3)

when

an

error

occurs.

The

keystroke

follow-

ing

the

RESET

key

returns

the

normal verify display

mode.

Error Correction

If a

character

keyed

while verifying

is

not

the

same as

the

corresponding

character

in

the

current

record

buffer,

the

following

occur:

1.

The

keyboard

locks.

2. A verify

mismatch

(V)

error

code

is

displayed

on

the

status

line.

3.

The

cursor

is

under

the

position

in

error.

4.

The

entire

record

is

displayed.

Use

RESET

to

reset

the

error

condition

and

then

correct

the

character

in

error.

The

first

character

key

following

the

error

is

accepted

if

the

character

keyed

agrees

with

either

the

character

in

the

current

record

buffer

or

the

character

that

caused

the

error.

If

the

first

character

key

pressed following

the

error

is

not

accepted,

a verify mismatch (V)

error

is

again displayed.

The

correction

process

is

continued

until all

corrections

have been

made

to

the

record.

Skip Functions

If

SKIP

is

pressed

or

a

programmed

skip field

is

encoun-

tered

during

verification,

the

entire

field

or

the

remainder

of

the

field

is

checked

for

blanks. If a

nonblank

character

is

encountered,

the

cursor

stops

in

that

position,

the

skip

action

terminates,

and

a verify mismatch (V)

error

is

displayed.

After

pressing RESET,

the

non-blank

character

can

be

replaced

with

a blank

by

pressing SKI

P.

The

station

then

continues

to

check

the

remainder

of

the

field

for

blanks.

14

Duplication Functions

Pressing DUP

or

entering a programmed

duplication

field

during

data

verification causes

the

rest

of

the

field

to

be

verified

automatically.

The

characters

of

the

record

in

the

current

record

buffer

are

compared

with

the

corresponding

characters in

the

previous record buffer. If

one

of

the

char-

acters

in

the

record disagrees

with

the

corresponding

char-

acter

in

the

previous record

buffer,

a verify

mismatch

error

is

posted.

After

RESET

is

pressed,

the

character

from

the

previous record

buffer

can

be

inserted

into

the

current

record

buffer

by

pressing DUP.

The

device

then

continues

comparing

the

field.

When using

the

auxiliary

duplication

feature,

the

characters

in

the

current

record are

compared

with

the

corresponding

characters in program

buffer

4.

Right-Adjust Fields

If a right-adjust field

is

encountered

while verifying

data,

the

cursor stays

in

the

first position

of

the

field until

the

first

data

key

is

pressed.

The

fill characters are

compared

depending

on

the

field

definition

characters, and

then

the

first

data

character

keyed

is

compared

with

the

first nonfill

character

in

the

field. If

neither

agree, an

error

occurs.

When fill

characters

are in

error,

the

cursor

is

at

the

start

of

the

field, When

data

does

not

match,

the

cursor

is

at

the

first non-fill

character.

To

exit

from

the

right-adjust field

after

verifying

the

last

character

in

the

field, press

either

RIGHT

ADJ

or

the

dash

(-)

key. RIGHT

ADJ

and

the

dash key also verify

the

field's sign, unless

the

field

is

alphabetic. (The dash key

is

used

to

verify a

numeric

field having a minus sign.) If

the

right-adjust field

is

alphabetic,

the

last

character

in

the

field

is

verified in

the

same

way

as a

character

in

any

other

posi-

tion

in

the

field.

If a verification

error

occurs while verifying

the

sign

of

a

right-adjust field, a right adjust sign (X)

error

is

displayed.

The sign can

be

changed

by

pressing

of

RIGHT

ADJ

or

the

dash key twice.

Press RIGHT

ADJ

or

the

dash key, if applicable,

to

exit

from every

programmed

right-adjust

fi

eld. Press

the

key

even

when

one

right-adjust field immediately follows ano-

ther

and

when

right-adjust fields

contain

all fill characters.

Failure

to

press

RIGHT

ADJ

or

the

dash

key

at

the

end

of

a

right-adjust field causes right

adjust

(R)

error

on

the

keystroke.

IBM 3741 Data Station User manual

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