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                                                        File No o 1410-33
                                                        Form C28-0304




                 Systems Reference Library




rBM 1410 Generalized Sorting Program

U sing IBM 1301 Disk Storage


This publication describes the mM 1410 Gener-
alized Sort:ing Program Using 1301 Disk Storage.
Included are descriptions of the basic specifications
and features of the program, the preparation of
control cards, operating instructions and messages,
th,e elements of the program, and methods of modi-
fication. Timing tables are also included.




@ 1963 by International Business Machines Corporation
PREFACE


 The IBM 1410 generalized sorting program using                           the program may easily be modified so that control
IBM 1301 Disk Storage has been developed for an                           information may be entered through any other input
IBM 1410 equipped with one or two IBM 1301 Disk                           unit, or left in core storage by a preceding program.
Storage modules. The program is considered a gen-                            Checkpoint and restart routines are included that
eralized sort because it is capable of modifying it-                      enable program operation to be resumed from the
self for a particular application according to control                    beginning of Phase 3.
information specified by the user.                                           If desired, the user may specify that a Write Disk
   This program will sort fixed-length or variable-                       Check operation be performed following each write
length data records, single or blocked. Basically,                        operation on the 1301. When specified, this option
it consists of three phases. Phase 1 consists of a                        is effective throughout all phases of the sort.
series of internal sorts; Phase 2 consists of one or                         It is assumed that the reader has a basic knowl-
more merging passes; and Phase 3 consists of the                          edge of sorting techniques, the IBM 1410 Input/Out--
final merging pass. To facilitate program scheduling,                     put Control System for card and tape systems and
the sorting program will permit input and/or output                       for 1301 Disk Storage, the IBM 1410 Data Process-
through any specified tape or disk unit on either chan-                   ing System, and IBM 1301 Disk Storage. Such infor-
nel. Provisions are included for the processing of                        mation can be obtained from the following publica-
header and trailer labels.                                                tions:
   The control data upon which the sort is based may                         "Sorting Methods for IBM Data Processing Sys-
consist of as many as ten control-data fields con-                              tems, " Form F2S-S001.
sisting of a maximum of 2799 characters. The con-                            "IBM 1410 Principles of Operation, 11 Form A22-
trol-data fields may be contiguous or may be scat-                              0526.
tered through the data record, but must not overlap.                         "IBM 1410 Data Processing System: 1301 Disk
   Core-storage space in eachphasemaybe reserved                                Storage, " Form A22-6670.
for added programming. Exits are provided at log-                            "IBM 1410 Input/Output Control System for Card
ical points in the program to facilitate the inclusion                          and Tape Systems," Form J2S-14~32.
of any additional routines desired by the user.                              "IBM 1410 Input/Output Control System for 1301
   The sorting program may be loaded either from                                Disk Storage, " Form J2S-0251.
tape or from the card reader. The control informa-                           "1301 Disk Storage with 7631 File Control,"
tion is normally entered through the card reader, but                           Form D22-6576.




This publication, C28-0304, obsoletes and replaces IBM 1410 Generalized
Sorting Program Using IBM 1301 Disk Storage Preliminary Specifications
and Timing Estimates, Form J28-0246.




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. 091, PO Box 390, Poughkeepsie, N. Y.
                                                  CONTENTS




PART I: SPECIFICATIONS AND FEA TURES                       5
Equipment Requirements                                     5
Input Specifications 

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