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
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IBM 3742 Duai
Data Station
IBM 3742 Dual
Data Station
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IBM 3742 Dual ' I
Data Station I
-------
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- ____ - .. 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