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IEFBR14 consisted initially of a single instruction a "Branch to Register" 14. The mnemonic used in the IBM Assembler was BR and hence the name: IEF BR 14.BR 14 is identically equivalent to BCR 15,14 (Branch Always [ mask = 15 = always ] to the address contained in general purpose register 14).
Name Description HED: Heading: Separates programs, possibly written separately, which are being assembled together. It can specify a character to be appended to symbol names in this section to avoid naming conflicts. REL: Relocatable Library Program: Defines the start of a relocatable library program being assembled ahead of the main program.
The application program interfaces of IBM's mainframe operating systems is defined as a set of assembly language "macro" instructions, that typically invoke Supervisor Call (SVC) [e.g., on z/OS] or Diagnose (DIAG) [on, e.g., z/VM] instructions to invoke operating system routines. It is possible to use operating system services from programs ...
Control units are assigned an address "capture" range. For example, a CU might be assigned range 20-2F or 40-7F. The purpose of this is to assist with the connection and prioritization of multiple control units to a channel. For example, a channel might have three disk control units at 20-2F, 50-5F, and 80-8F.
The output is binary data in the twelve card rows 12, 11, and 0–9. Each row contains two 36-bit words in columns 1-36 and 37-72, indicated as left (L) and right (R) respectively. Data is conventionally numbered by row and position, for example, columns 1 to 36 of row 9 are designated 9L, columns 37 to 72 of the same row are 9R.
HASP was developed by IBM Federal Systems Division contractors at the Johnson Space Center in Houston. [1] [2] It originally managed job scheduling and print and punch output for a single OS/360 computer. Multi Access Spool capability was added to let peer computers share a common job queue and print/punch output queues. [citation needed]
Header spec is at the top of the program and describes compiler options such as maximum compile size, whether the program is an MRT (Multiple Requestor Terminal) program, and what type of listing is generated when the program is compiled. The object name of the program created is located in columns 75–80; if a source does not have an H spec ...
The Control Language (CL) is a scripting language originally created by IBM for the System/38 Control Program Facility [1] and later used in OS/400 (now known as IBM i). It bears a resemblance to the IBM Job Control Language and consists of a set of command objects (*CMD) used to invoke traditional programs or get help on what those programs do.