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The Sort/Merge utility is a mainframe program to sort records in a file into a specified order, merge pre-sorted files into a sorted file, or copy selected records. Internally, these utilities use one or more of the standard sorting algorithms , often with proprietary fine-tuned code.
The operation of SORT is directed by control statements, which are largely compatible among various IBM and third-party sort programs. The SORT or MERGE statement defines the sort keys— the fields on which the data is to be sorted or merged. This statement identifies the position, length, and data type of each key.
Software for this model did not include an operating system—the RCA 70/15 Programming System consisted of an "Assembly System, Loader Routines, Input-Output Control, Test Routines, Utility Routines, Communication Control, System Maintenance Routines, Report Program Generator, and Sort/Merge." Sort/Merge required a system with 8 KB of memory.
A "panel" is a character-based "window" which can encompass all or part of a 3270 session's screen real estate. See Text-based user interfaces. Most mainframe software vendors used ISPF functions to create their applications, so their tools are similar in appearance and operation to ISPF.
Early mainframe printers were usually line printers. Line printers provide a limited set of commands to control how the paper is advanced when print lines are printed. The application writing reports, list, etc. to be printed has to include those commands in the print data. These single character print commands are called printer control ...
TOS/360 (Tape Operating System/360, not a DOS as such and not so called) was an IBM operating system for the System/360, used in the early days around 1965 to support the System/360 Model 30 and similar platforms. TOS, as per the "Tape" in the name, required a tape drive. It shared most of the code base [4] and some manuals [5] [6] with IBM's ...
In the context of IBM mainframe computers in the S/360 line, a data set (IBM preferred) or dataset is a computer file having a record organization. Use of this term began with, e.g., DOS/360, OS/360, and is still used by their successors, including the current z/OS. Documentation for these systems historically preferred this term rather than file.
The IBM System/370 (S/370) is a range of IBM mainframe computers announced as the successors to the System/360 family on June 30, 1970. The series mostly [b] maintains backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the product announcement.