IBM 3742 User manual
Systems
GA21-9151-0
IBM
3740
Data
Entry
System
IBM
3741
Data
Station
IBM
3742
Dual Data
Station
Reference
Manual
Preface
This publication
is
a reference manual for
customer
appli-
cations personnel
and
key
entry
supervisory personnel
who
wish specific information
about
the
IBM
3741 Data
Station
and
the
IBM
3742
Dual Data
Station.
Information
in this manual pertains
to
both
the
3741
and
3742
unless specified otherwise. Chapter 1 presents a gen-
eral overview
of
the
3740
system and
the
3741
and
the
3742,
listing
the
standard
functions
and features available.
Chapter
2 presents
information
about
the
IBM
Diskette.
Chapter
3 deals with
operating
characteristics in
terms
of
data
flow, modes
of
operation,
disk unit, and buffers.
Chapter
4 defines
the
display
unit
and
the
keyboard. Chap-
ters 5
through
12
~eal
with
specific details
about
functions
and features,
and
programming information required
by
them.
Appendix
A gives a list
of
possible
error
codes,
their
causes,
and
possible recoveries.
First Edition (January 1973)
Changes are continually made
to
the
specifications herein; any such changes will
be
reported
in subsequent revisions
or
Technical Newsletters.
A Reader's Comment Form
is
at
the
back
of
this publication. If
the
form
is
gone, address
your comments
to
IBM
Corporation, Publications, Department
245,
Rochester,
Minnesota
55901.
© Copyright International Business Machines Corporation
1973
(
Contents
CHAPTER
1.
IBM
3740
DATA
ENTRY
SYSTEM.
Offline
Field
Totals.
33
System Overview Selecting
Offline
Field Totals
33
IBM
3741 Data
Station
and
IBM
3742
Dual Data Mask Statements
33
Station Overview 3 Displaying
Offline
Field
Total
Accumulators
34
Writing Field Totals
into
Record
on
Disks 34
CHAPTER
2. IBM
DISKETTE
6
Example.
34
Disk
Layout
. 6
Index
Track
Layout
7 CHAPTER 8. SECOND
DISK
37
Index
Track
Data Set Labels 8 Dual Disk Preparation on
3742
37
Dual Disk Operation
on
the 3741 and 3742 . 37
CHAPTER
3.
DATA
STATION
OPERATING
Search Operations on the Second Disk 38
INFORMATION
10
Copy . 38
Buffers 10 Copy
All
or
Part
of
Disk 2 . 38
Modes
of
Operation
10
Copy
All
or
Part
of
a Data Set 38
Enter Mode (E) 10 Copy
Up
to
a Specified Record on Disk 2
39
Update Mode (U)
11
Handling Disk Errors
that
Occur While Copying
Verify
Mode
(V)
11
All
or
Part
of
Disk 2 39
Field Correct Mode (C)
13
Search Mode
(S)
13
CHAPTER 9.
DISK
INITIALIZATION
40
Read Index Mode
(X)
16
I
nitialization
Procedure
41
Modify
Mode (M)
16
Disk Checking
41
Field Totals Mode (F) 16
Starting
Information
17
CHAPTER 10.
SELF-CHECK
FEATURE
42
Record Advance Operation 17 Computing the Self-Check
Digit
42
Deleted
Records.
18 Modulus 10 42
Mode Considerations
for
Deleted Records 18 Modulus
11
43
CE
Mode.
18 CHAPTER 11.
COMMUNIGATIONS
44
CHAPTER
4.
OPERATOR
INTERFACE
19 Teleprocessing Bibliography
44
Display 19 Programming
Support
45
Keyboard
20
Networks
45
Switches
20
Communications
Facilities.
46
Function
Select Keys
20
Communications
Throughput
46
Character Keys
21
3741 Transmission Modes .
49
Function
Keys
21
Features
49
Synchronous Clock Feature
49
CHAPTER
5.
PROGRAMMING
INFORMATION
26
Terminal
Identification
Feature
50
Program Coding •
26
Operator
Identification
Card Reader Feature 50
Loading a Program
26
Keylock Feature
51
Selecting a Program •
26
Operating Procedures
51
Displaying a Program
28
Communication
Modes.
51
Modifying
a Program 28
Transmit
Mode
(T)
51
Program Chaining 28 Transmit-Transparent Mode
(P)
56
Operator Guidance . 29 Receive Mode (R)
56
Transmit/Receive Mode (B) 57
CHAPTER
6.
PRODUCTION
STATISTICS
30
Transmit-Transparent/Receive Mode (D) 57
Counters .
30
Communications Example . 57
Keystroke Counter .
30
Line
Termination
and Error Conditions
58
Record Counter .
30
Termination
of
Data Call 58
Verify
Correction Keystroke Counter 30 BSCA Error Conditions and Indications
59
Displaying Production Statistics
30
BSCA Disk Errors
60
Track
and Sector Indicators
61
CHAPTER
7.
FIELD
TOTALS
31
Status
Message
Format
•
61
Online Field Totals .
31
Displaying Field
Totals.
31
Read Out/Reset Fields .
31
Online Field
Total
Restrictions 32
Example.
32
CHAPTER 12.
IBM
3713
PRINTER
Uses
•
Hardware.
Adjustable Margins Feature
Forms Stand Feature
Functions
Printer Modes
Printer Formatting
ii
62
62
62
62
62
62
62
63
APPENDIX
A. ERROR
AND
ALERT
CODES.
Disk
Initialization
Errors
INDEX
71
79
81
iii
SYSTEM
OVERVI
EW
The
IBM
3740
Data
Entry
System
is
a family
of
products
that
satisfies a variety
of
key
entry
requirements.
The
3740
system
is
equally
adaptable
to
centralized, decentral-
ized, and
remote
key
entry
environments. Original records
are
entered
much
like
they
are
on
a
standard
keypunch.
The
characters are
entered
in
temporary
storage as
they
are keyed
and
written
on
the
disk
after
the
complete
record
has been keyed.
A key
element
of
the
3740
system
is
a magnetic recording
medium,
the
I
BM
diskette.
This disk
is
an economical
means
of
storing
data
and replaces
the
standard
punched
card.
One
disk holds
1898
records, roughly
the
equivalent
of
one
box
of
80-column cards.
Furthermore,
the
disk can
be used over
and
over,
and
data
that
has been
entered
on
the
disk can be easily
corrected
and
updated,
thus
elimina-
ting
the
rekeying
of
entire
records
and
the
scrapping
of
cards.
The
3740
system devices are:
•
IBM
3742
Dual Data
Station:
Designed for
data
entry
use in a centralized transcription location.
•
IBM
3741 Data
Station
Models 1
and
2: Designed
for
data
entry
use as a stand-alone
station
in a decentralized
or
remote
location as well as
in
a centralized transcrip-
tion
area.
•
IBM
3747
Data Converter: Designed
to
convert
data
entered
on
magnetic disk by
the
data
stations
to
mag-
netic
tape
for use
by
other
9-track systems
and
to
con-
vert
data
from
magnetic
tape
to
disk for updating
by
the
3740
system.
•
IBM
3713
Printer: Designed
to
attach
to
the
3741
to
provide hard
copy
output.
Chapter 1. IBM 3740 Data
Entry
System
Thus, as shown in Figure 1,
the
IBM
3740
is
actually
an
integrated data
entry
system answering
today's
require-
ments for data
entry
in various operating environments.
In
a centralized
transcription
environment, a typical instal-
lation includes a
number
of
IBM
3742
Dual Data
Stations
for recording
data
on
diskettes. An
IBM
3747
Data
Con-
verter would be included
to
convert
the
data
to
one-half
inch, 9-track
tape
for processing
by
the
host
central pro-
cessing unit.
In
a decentralized transcription environment, several
IBM
3741 Data
Stations
would
be located
throughout
a business
site.
For
instance,
one
station
might be
in
the
parts
distri-
bution
department
and
used by
the
inventory
clerk
to
enter
part
movement
information.
Other
stations
might
be in
manufacturing
departments
where requests for
parts
are
entered by a
control
person. A
diskette
would
be
sent
to
other
departments
or
to
a location having a converter.
In
a remote
environment,
a typical
situation
would
include
one
or
more
IBM
3741 Data
Stations
at
various offsite
locations, or, if
the
work
load
is
heavy,
IBM
3742
Dual
Data Stations. Perhaps parts are
distributed
from
a ware-
house
to
several divisions
of
a
company
located miles
apart.
The
inventory
data
would
be
entered
via
the
data
station
on
disk as transactions occurred. Periodically
the
data
would
be
transmitted
to
the
warehouse via an
IBM
3741 Data
Station
Model 2
with
binary
synchronous
communications.
IBM
3740
Data
Entry
System
Centralized
Location
IBM 3742 Dual
Data Station \\\\\
IBM 3747
Data Converter
IBM 3742 Dual
Data
Station
--p
I',t
I
,~
IBM 3742 Duai
Data Station
IBM 3742 Dual
Data
Station
/
,'I
,'I
"I
1'1
I
'I
I
'I
,I
I I
I I
, I
, I
I
I
I
I
IBM 3742 Dual ' I
Data Station I
-------
I
-
____
-
..
1
Decentralized
IBM 3741
Data
Station Model 1
Figure
1.
An
Integrated
Data
Entry
System
2
Legend:
Hand Transported - - - -
Remote Location
(offsite)
IBM
System/360
IBM System/370
CPU
or other
9-
Track Systems
Receiving
Device
IBM 3741 Data
Station Model 2
Remote Location
(offsite)
IBM 3741 Data
Station Model 2
IBM
3741
Data Station
and
IBM
3742
Dual Data Station
Overview
The
IBM
3741 Data
Station
Model 1 (Figure 2)
is
a stand-
alone device
with
one
operator
station,
which
has
one key-
board
unit,
one display
unit,
one
or
two
disk
units,
and a
control
unit.
In
addition,
the
Model 2
is
equipped
with
a
binary
synchronous
communications
adapter.
Control
Unit
Display
Unit
\
Figure 2.
IBM
3741 Data
Station
The
IBM
3742
Dual Data
Station
(Figure 3)
is
a stand-alone
device
with
two
operator
stations, each
with
it
s
own
key
-
board and
disk
unit
.
The
3742
has
only
one
control
unit
and one shared display
unit
.
For
a listing
of
standard
functions
and features available
on
each
of
the
data stations,
see
Figure 4.
For
detailed
infor-
mation
about
these
functions
and features,
see
the
appro-
priate index reference
s.
Keyboard
Unit
Disk
Unit
s
J
IBM
3740
Data
Entry
System 3
IBM
3741 Data
Station,
Standard
Function
or
Feature
Models 1
and
2
IBM
3742
Dual Data
Station
Entering
and
updating records
Standard
Standard
Search
on
record address
Standard
Standard
Search
on
sequential
content
Standard
Feature
Search
on
content
Standard
Feature
Search
on
end
of
data
Standard
Standard
Program chaining
Standard
Standard
Operator
guidance
Standard
Not available
Levels
of
program
control
Ten standard Six
standard;
four
additional
(per
operator
station) available with a
feature
Record length
Standard
1
to
128
characters Standard
80
characters
Feature 1
to
128
characters
Verify Feature
Standard
Production
statistics Feature
Standard
Self-checking
number
Feature
Feature
(modulus
10
and 11)
Offline field
totals
Feature Feature
Onl ine field totals Feature Not available
Disk
copy
Feature Feature
Disk initialization
Feature
Feature
Second
disk
attachment
Feature
Not available
Printer
Feature
Not available
Binary
synchronous
Standard
on
the
3741 Model 2 Not available
communications:
and
not
available
on
Modell
Keylock
Feature
on
Model 2 Not available
Terminal identification
Feature
on
Model 2
Not
available
Synchronous
clock Feature
on
Model 2 Not available
Operator
identification
Feature
on Model 2 Not available
card reader
Figure 4. Standard Functions and Available Features
IBM
3740
Data Entry
System
5
Chapter 2.
IBM
Diskette
The
IBM
diskette (Figure 5)
is
a flexible Mylar* disk con-
tained within a protective cartridge
about
8.0 inches square.
Data
is
recorded and read serially on
the
disk
in
the
same
way
data
is
processed on magnetic tape. Records can be
accessed directly as with system-attached magnetic disk
drives.
The
diskette falls between the punched card and
one-half inch magnetic
tape
in
terms
of
data storage capa-
city and functional characteristics. It combines
the
small
batch
data
storage properties
of
punched cards with many
of
the
features
of
one-half inch magnetic
tape
and
has
the
added advantage
of
direct access.
In
addition,
the
diskette
fits easily into
the
procedures
of
most punched card instal-
lations, replacing cards with minimum changes required.
When compared
to
the
punched card,
the
disk has
the
fol-
lowing advantages.
• Reusability
to
reduce media cost.
• Ease
of
erasure and error correction.
• Very favorable ratio
of
size and weight
to
data stored.
One small disk can usually hold
the
entire
day's
output
from
the
typical key
entry
station.
• Improved data readout speeds. This speed
is
advanta-
geous when either
the
3741 Model 2 or
3747
data con-
verter
is
attached
to
a data processing system
via
com-
munications.
•
The
ability
to
easily back
up
and reread data for retrans-
mission
in
case
of
communication errors.
• Portability and mailability
of
useful quantities
of
data.
• Machine-assisted direct access
to
offline batch data files.
DISK LAYOUT
The disk
unit
reads and writes
on
only
one
side
of
the
disk.
The physical
layout
of
the
disk
is
shown
in
Figure 6. Each
disk
is
divided into an index track and
73
data tracks
or
circles similar
to
the
grooves on a record. The.track
is
div-
ided
into
26
sectors. Thus, any
data
record can be located
by an address consisting
of
a track number and a sector
number. Twenty-six records
of
up
to
128
characters each
can be
written
on
each track.
The
capacity
of
the
disk
is
1898
data
records.
*Trademark
of
E I
duPont
de Nemours & Co., Inc.
6
Figure 5. 18M-Diskette
1 Data Record
Address: Track
03
Sector
07
Figure 6. Physical Disk
Layout
Sector
07
Each
of
the
26
sectors has a sector identification field and a
data field. A field
is
a predefined number
of
data
positions
designated for a specific use.
The
identification field con-
tains
the
track
number
and sector number.
The
identifica-
tion fields are prerecorded for
the
entire disk during an
initialization process and are
not
rewritten
or
changed dur-
ing normal disk use.
The
data
field has space for
one
phy-
sical record.
The
maximum record length, called physical
record length,
is
always
128
characters. However,
the
logi-
cal record length
on
the
3741 can be anywhere from 1
to
128 characters. On
the
standard
3742,
the
logical record
length
is
always
80
characters; a variable length logical
record
of
1
to
128
characters
is
available
as
a feature.
Sector Contents After Writing
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
Index Track
Layout
The
first track
on
a disk, called
the
index
track
and num-
bered 00, contains a maximum
of
26
records for system
or
data set information.
All
remaining tracks (01
through
73)
can be used for
data
records.
Each record
~n
the
index
track
has a logical record length
of
80
characters and a physical record length
of
128
char-
acters.
The
index
track
format
is
shown
in
Figure 7.
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.
The
remaining sectors (08-26) may contain data
set
labels,
which are used
to
define
the
data
sets resident
on
the
disk.
If 1 or 2 bad tracks were specified, 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
123456789101112
______________
7677787980
VOL11~D
1
tJ~_tJ
'\
tJ
w
Volume ID 12 through
76
contain blanks
Accessibility -
Any nonblank
character means
disk
is
not
Sectors
8-26 Data set labels
Figure 7. Index Track Layout
accessible
Sector
sequence
information
IBM
Diskette 7
Index
Track
Data
Set
Labels
Sectors 8
through
26
of
the
index
track
are used primarily
as
data
set labels. A
data
set label defines
pertinent
infor-
mation
about
a
data
set
on
the
disk such as beginning
of
extent
(BOE), end
of
data
(EOD),
end
of
extent
(EOE),
and
the
record length
for
the
data
set.
For
exact
layout
of
the
data
set label, see Figure
8.
Position
by
Position Representation
of
Data
on
the
Index Track in
Any
One
Sector
of Sectors 8-26.
Field Name Position Purpose
Header 1 1-4 Label identifier for system application;
must
be HDR1.*
5 Reserved
Data set name
6-13
User 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. Positions
29
and
30
extent
(BOE)
contain
the
track
number,
position
31
must
be 0, positions
32
and
33
contain
the
sector
number.*
34
Reserved
End
of
extent
35-39
Identifies
the
address
of
the
last sector reserved for
th
is
data
set.*
(EOE)
40
Reserved
Bypass
data
set
41
The
IBM
3747
data
converter
requires
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.
Accessibility
42
This field
must
contain
a blank in
order
for processing
to
take
place.
Write
protect
43
If this field
contains
a
P,
the
disk can be read only. Otherwise this field
must
be a blank,
in
which case
both
reading
and
writing are
permitted.
*Indicates an
entry
required' by
the
3740
system.
Figure 8 (Part 1 of 2). Data
Set
Label Layout
8
Position
by
Position
Representation
of
Data
on
the
I
ndex
Track in
Any
One
Sector
of
Sectors
8-26.
Field Name Position Purpose
44
Reserved
Multivolume
45
A blank in
this
field indicates a
data
set
is
not
continued
on
or
from
another
indicator
diskette;
a C indicates a
data
set
is
continued
on
another
diskette;
an
L
indicates
the
last
diskette
on
which a
continued
data
set
resides.**
46-72
Reserved
Verify
mark
73
This field
must
contain
a V
or
a blank. V indicates
the
data
set
has
been
verified.
74
Reserved
End
of
data
75-79
Identifies
the
address
of
the
next
unused sector.
80
Reserved
**When preparing
data
for
conversion
by
the
3747,
check
the
IBM
3747Data Converter Reference Manual,GA21-9153,
for
the
interpretation
of
the
multivolume
byte.
Figure 8 (Part 2
of
2). Data
Set
Label
Layout
IBM
Diskette 9
Chapter 3. Data Station Operating Information
The
entering, updating, verifying
or
finding
of
data
on
a disk
is
performed
by
the
data
stations
using
different
modes
of
operation.
The
sequence
of
operations
performed
by
the
control
unit
within
the
data
station
is
directly depende.nt
upon
the
mode
in which
the
station
is
functioning. Buffers
store
and
transfer
data
within
the
station
to
allow
communication
between
the
keyboard,
disk,
and
display.
Each
mode
of
operation
is
unique,
and,
therefore,
the
use
of
buffers, keys, and
the
information
displayed
is
different
for
each
mode.
The
mode
of
operation
is
indicated by a
code
displayed
on
the
status
line
of
the
display unit. Some
of
the
modes
<?f
operation
for
the
3741
and
3742
and
their
corresponding
display codes are:
Mode Display
Code
Enter E
Update
U
Verify V
Field
correct
C
Search S
Read index X
Modify M
Field
totals
(offline) F
BUFFERS
Buffers are used
to
communicate
with
the
keyboard,
display,
and disk.
The
buffers
are
the
current
record buffer, previous
record buffer, hold
buffer,
and several
format
buffers.
The
current
record
buffer
stores
data
characters as
they
are
keyed
or
receives records
that
are read from disk during
update
mode. Data
information
displayed
on
the
screen
is
from
the
current
buffer.
The
previous record
buffer
normally
contains
the
last
completed
record. Data
is
written
on
the
disk
from
this
buffer
and
can
also be
dupl
icated
and
placed in
the
current
record buffer.
The
hold
buffer
is
used
to
store
the
next
record
to
be
processed when verifying
data
or
to
store a mask used
during
search operations.
10
MODES
OF
OPERATION
Enter
Mode (E)
Enter
is
the
most
basic
mode
of
operation.
Enter
mode
can
be selected
from
the
index
track
only;
an M
error
results if
enter
mode
is
selected when
in
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
next
record
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
displayed
on
the
screen.
At
record advance,
the
data
is
moved
to
the
previous record
buffer
and
the
current
record
buffer
is
filled
with blanks.
At
the
same time
that
the
next
data
record
is
being keyed,
the
record
in
the
previous
record
buffer
is
written
on
the
disk.
~
Keyboard
0,--1
__
-'I
•
o
Disk .....
_____
OJ
Figure
9.
Data
Flow
for
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 an M
error. However,
the
mode
automatically
changes
to
the
update
mode
when
record backspacing occurs during
the
enter
mode.
The
search
mode
also
automatically
changes
to
update
mode
at
the
end
of
a search
operation.
A 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.
Record
is
read
from
...........
---
disk
into
current
Disk
record
buffer
and
displayed.
Any
changes are
keyed
into
current
record
buffer.
~
011.-
------'I
•
o
nm~
~~
Record advance
transfers
data
to
previous record
buffer
and
reads
next
record
into
current
record
buffer. If
data
was
changed,
it
is
written
to
disk.
Keyboard
Figure
10.
Data
Flow
for Update Mode
If record advance reaches EOD during
update
mode,
the
mode
of
operation
automatically
changes
to
enter
mode.
However, an
auto
return
to
index
track
is
performed
if
the
data
set
is
protected
by
a
write
protect
byte
in
the
label (a
G
error
is
displayed)
or
if
the
data
set
is
full (an E
error
is
displayed).
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
automatica'ily
compared
with
the
corresponding
character
in
the
record in
the
current
record
buffer.
If
the
characters
do
not
compare,
a 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
from
read index
mode
or
update
mode,
the
previous record
buffer
is
automatically
filled
with
blanks,
and
the
first non-deleted record
is
read
into
the
current
record
buffer.
Next record
is
read
from
disk
into
the
......
'-----
hold buffer.
The
record
is
transferred
at
record
Disk
advance
to
the
current~
record buffer
and
diSPlayel
Keyed data
is
com-
pared with
the
data
in
DL-I
__
----oJ
•
o
~:;:~~
:~~~~c:uffer.
~~
lIM
i
f~~'"
transfers
data
to
__
____1
__
_
previous record buffer.
Data
written
to
disk Keyboard
only
if
data
was
changed.
Figure
11.
Data Flow
for
Verify Mode
Data
Station
Operating
Information
11
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 V
error
code
is
displayed
on
the
status
line.
3.
The
cursor
stops
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
error
is
again displayed.
The
correction
process
is
continued
until all
corrections
have been made
to
the
record.
RecordAdvance
When a record advance
is
performed
on
a
corrected
record,
the
record
is
rewritten
on
the
disk as
corrected.
If
there
were
no
corrections
to
the
record, it
is
not
rewritten
during
record advance. If
no
verification
or
correction
to
a record
has
taken
place
and
the
cursor
is
in
the
first manual posi-
tion
of
the
record, pressing R
EC
ADV causes a record
advance
function
to
occur
without
verification
of
the
record. Pressing REC ADV when
the
cursor
is
in
other
than
the
first manual position
of
a record causes all remain-
ing manual fields
to
be verified as blanks; remaining
auto
dup
fields are verified
and
bypass fields are bypassed.
Skip Functions
If
SKIP
is
pressed
or
a
programmed
skip field
is
encoun-
teredduring
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 V
error
is
displayed.
After
press-
ing RESET,
the
nonblank
character
can be replaced with
a blank
by
pressing SKIP.
The
station
then
continued
to
check
the
rest
of
the
field
for
blanks.
12
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.
Verification Code
After
the
last record
in
a
data
set
has been verified, a
verification
code
(V)
is
automatically
inserted in
the
verify
field
of
the
data
set
label,
the
mode
of
operation
changes
to
a read index
mode,
the
data
set
label
is
displayed, an E
alert
is
displayed, and program level 0
is
selected.
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
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
record are
compared
with
the
corresponding
charac-
ters
in
the
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
the
characters
do
not
agree, a V
error
occurs.
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
position
in
the
field.
If a verification
error
occurs while verifying
the
sign
of
a
right-adjust field, an X error
is
displayed.
The
sign can be
changed by
two
depressions
of
RIGHT ADJ
or
the
dash key.
Press RIGHT ADJ
or
the
dash key, if applicable,
to
exit
from
every programmed right-adjust field. Press
the
key even
when
one
right-adjust field immediately follows
another
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 an error
on
the
next
data
keystroke.
When a right-adjust field
is
the
last field in an 80-character
record
on
the
3742
or
a 128-character record
on
the
3741
or
3742
with
the
128
feature
and
the
field has been verified
but
RI
GHT
ADJ has
not
yet
been pressed,
the
cursor
posi-
tion
indicator
is
129
for
the
3741
or
3742
with
the
128 fea-
ture,
or
81
for
3742,
and
the
cursor
is
not
displayed.
In verify mode, RIGHT ADJ
or
the
dash key should be used
only
when
the
cursor
is
in
the
first position
of
the
right-
adjust field
(to
verify a zero
or
a blank field)
or
when
the
field
is
full (the cursor will have moved
to
the
first position
of
the
next
field). If these keys are pressed
when
the
cur-
sor
is
in
any
other
position, an R error occurs.
Signs
If
the
units position
of
a numeric right-adjust field
contains
a negative
number
(0
zone),
the
sign and
the
value
of
the
field are verified separately.
The
first
keystroke
for
the
units position verifies
the
digit. If
the
character
is
correct-
ed,
only
the
digit
portion
is
changed.
The
sign
(0
zone)
is
is
not
affected.
To
exit
from
the
field, use
the
dash key.
The dash key also verifies
the
sign.
If
the
units position
of
a right-adjust field has a 0 zone
(dash)
but
the
field
is
alpha,
the
entire
character
is
com-
pared. If
corrected,
the
entire
character
is
changed.
Exit
from
the
field using RIGHT ADJ.
To
verify a dash charac-
ter
in a numeric right-adjust field, press ALPHA
SH
1FT
with
the
dash key.
Hexadecimal Data
Verify hexadecimal
data
in
the
same way
it
is
entered:
1. Press HEX.
2. Press
two
character
keys
correxponding
to
the
hexa-
decimal digits
wanted.
The
character
is
verified
after
the
last keystroke for
that
character.
Field
Correct
Mode (C)
Field
correct
mode
may be used
to
correct
an entire field
with a minimum
number
of
keystrokes.
The
field
correct
mode
can be selected
from
the
verify
mode
only.
To
select
the
field
correct
mode, press
FI
ELD COR.
The
cursor
moves
to
the
first position of
the
current
field, and
the
field can be rekeyed
as
if in
the
enter
mode. When
the
end
of
the
field
is
reached,
the
cursor
then
moves back
to
the
first position
of
the
field and
the
mode
changes
to
verify.
Selecting field
correct
mode
when
not
in
verify mode
or
while processing a programmed
auto
field in verify
mode
results
in
an M error. FIELD ADV
and
CHAR ADV are
valid
in
the
field
correct
mode.
The
field
correct
mode
changes back
to
the
verify mode
when
a field
or
character
backspace moves
the
cursor
out
of
the
current
field.
Search Mode (S)
Use
search
mode
to:
• Search
on
record address from read index,
update,
or
enter
mode.
• Search
to
end
of
data
from
read index or
update
mode.
• Search
on
content
from
read index
or
update.
• Search
on
sequential
content
from
read index,
update,
or
enter
mode.
For
data
flow
information, see Figure 12.
Note: After pressing any search key,
but
before pressing
R
EC
ADV,
the
search
operation
can be canceled by pres-
sing FUNCT SEL lower and RETURN
TO
INDEX
or
by
pressing FUNCT
SEL
lower
and
UPDATE.
Search on Record Address
To
search for a record in a
data
set, key its
track
and
sector
location.
The
track
and
sector
address specified can be
the
beginning-of-extent address,
the
end-of-data address minus
one,
or
the
address
of
any record
between
these
two
addres-
ses. Select
the
search mode
to
do
a search
by
record address
operation
from
the
read index,
update,
or
enter
mode.
Selecting
the
search by record address
function
from
any
other
mode causes an M selection error.
Data
Station
Operating
Information
13
. .
4j'iflllI~
Mask
IS
keyed Into _
the
current
record
. d Keyboard
buffer and dlsplaye .
I
Mask
is
transferred
to
hold buffer
at
the
start
of
the
search.
Records are read into
current
record buffer
until a match
is
found.
Records are read into
"""'
......
____
_
current
record buffer
and
compared
with
the
mask
in
the
hold
buffer until a match
is
found.
Figure 12. Data
Flow
for
Search Mode
To
search
on
record address:
1. Press FUNCT SEL lower.
DL-I
__
.....I
•
o
Disk
2. Press SEARCH ADDRESS. Pressing this key puts
the
keyboard in
the
numeric shift, blanks
the
current
record buffer, moves
the
cursor
to
position 1, and
selects program level
O.
3. Enter
the
address
of
the
record
you
are searching
for
in positions 1 through 5
of
the
current
record buffer.
The
address must be
in
the
format
TTOSS where T
is
the
track
number
and S
is
the
sector
number. For
example, 07011
is
the
address of a record
at
track
07,
sector
11.
4. Press R
EC
ADV
to
start
the
search.
14
The search stops
on
the
record address specified. The
record
at
the
specified address
is
displayed.
The
current
record buffer and
the
previous record
buffer
are equal
at
the
end
of
the
search and
the
mode changes
to
the
update
mode.
An I
error
is
displayed
if
the
search address
is
specified
incorrectly, if
the
address
is
greater
than
or
equal
to
the
end-of-data address
or
less
than
the
beginning-of-extent
address
for
the
data
set,
or
if
the
address
is
on
the
index
track.
If
an invalid address was
entered,
the
cursor
moves
to
the
first position
of
the
data line on
the
display screen.
If a search address
operation
is
attempted
on
an
empty
data
set, a Y error occurs.
If
a seek
or
no record
found
error
occurs during a search
to
record address
operation,
the
data
station
returns
to
the
data
set
label.
Search
to
End
of
Data
To
search
to
the
last record
of
a
data
set
(end-of-data
address minus one), press FUNCT SEL lower
and
then
press SEARCH EOD. Select
the
search
to
the
end-of-data
function
from
the
read index, enter,
or
update
mode.
Selecting it
from
any
other
mode gives an M error.
When
the
search
is
completed,
the
current
disk address
is
set equal
to
the
last record
in
the
data
set
and
the
record
is
displayed. The
contents
of
the
previous record buffer
is
set
equal
to
the
current
record
buffer
and
the
mode
of
operation changes
to
update.
If
this search
operation
is
selected when
the
end-of-data address equals
the
beginning-
of-extent
address, a Y
error
occurs. If a seek
or
no
record
found
error
occurs during a search,
the
data
station
returns
to
the
data
set
label.
Search on
Content
Use search on
content
to
find records
that
are identified by
the
content
of
specified character positions.
The
specifica-
tion
of
the
identifying characters and
their
positions
is
called a mask. The mask can be
anyone
or
more
positions
of
a record
and
may include
the
entire record.
The
mask
character positions
do
not
need
to
be contiguous. The
search will
stop
only on a record
that
contains
an
exact
match between
the
record and
the
search mask. The blank
character
is
used
to
identify positions
that
are
not
included
in
the
mask; therefore,
the
blank
cannot
be used successful-
ly as a character within a mask.
For
example, if a certain
field in a record contains ABIiCD
and
the
search mask
ABlICD
is
used,
the
search will
stop
on
the
first record
that
contains
AB
in
the
first
two
positions
of
the
field and
CD
in
the
last
two
positions
of
the
field.
Any
of
the
256
char-
acters might be in
the
third
position
of
the
field.
This manual suits for next models
2
Table of contents
