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File No. 1410-33
Form C28 -0343
Systems Reference Library
IBM 1410 Tape Sorting/Merging Programs: Sort/Merge 12
This publication describes the functions and features
of the IBM 1410 Sort/Merge 12 Program, a tape
sorting and merging program using the Processing
Overlap and Priority special features. It provides
the programmer and operator with complete infor-
mation for best use of the program. It presents sub-
stantial modifications and expansions to material in
the previous Sort/Merge 12 publication, Form
J28-0253. It also includes the 1410 Sorting times
contained in Form C28-0293.
In addition to complete program specifications,
the publication furnishes control card formats,
detailed operating instructions, and information
on the use of modification exits.
@ 1962, 1963 by International Business Machines Corporation
PREFACE
This publication provides detailed information 2. Sort on one through ten control data fields;
for programmers, systems analysts, and each field can contain from one through 9990
machine-room personnel on the use of the IBM characters.
1410 Tape Sortin~Merging Program: Sort/
3. Merge two through five sequenced files.
Merge 12.
Sort/Merge 12 is an efficient tape sorting and 4. Reblock and/or sequence check a se-
merging program which is directed by user- quenced file.
supplied control cards. It makes use of the
Overlap and Priority special features to permit 5. Label output tapes, as directed through
overlap of the read/write and processing oper- control cards.
ations, and so provides most efficient use of 6. Provide automatic checkpoint and restart
computer time. The program can perform the facilities.
following functions:
1. Sort and merge files composed of Form 1, 7. Provide exit points to link Sort/Merge 12 to
Form 2, Form 3, or Form 4 data records user-supplied routines to perform editing,
(see "Record Formats"). summarizing, and other functions.
Major Revision (July, 1963)
This publication supersedes the preliminary reference manual,
IBM 1410 Tape Sorting/Merging Programs: Part II, Sort/Merge
12, Form J28-0253, with its associated Technical Newsletters
(N28-1028 and N28-1020); and the Systems Reference Library
publication, IBM 1410 Tape Sorting Programs, Sort/Merge 12:
Sorting Times for the IBM 1410 with 7330, 72911, 729IV or 729V
Tape Units, Form C28-0293, with its aSSOCiated Technical News-
letter (N28-1056).
Copies of this and other IBM publications can be obtained through IBM Branch Offices.
Address comments concerning the content of this publication to:
IBM Corporation, Programming Systems Publications, Dept. D91, PO Box 390, Poughkeepsie, N. Y.
CONTENTS
GENERAL CONSIDERATIONS 6 Useful Modifications.