An access method is a function of a mainframe operating system that enables access to data on disk, tape or other external devices.
An assembly (or assembler) language, often abbreviated asm, is a low-level programming language, in which there is a very strong (but often not one-to-one) correspondence between the assembly program statements and the architecture's machine code instructions.
COBOL (an acronym for "common business-oriented language") is a compiled English-like computer programming language designed for business use.
A computer is a device that can be instructed to carry out sequences of arithmetic or logical operations automatically via computer programming.
Fortran (formerly FORTRAN, derived from Formula Translation) is a general-purpose, compiled imperative programming language that is especially suited to numeric computation and scientific computing.
In computer science, a high-level programming language is a programming language with strong abstraction from the details of the computer.
Machine code is a computer program written in machine language instructions that can be executed directly by a computer's central processing unit (CPU).
A macro (short for "macroinstruction", from Greek μακρός 'long') in computer science is a rule or pattern that specifies how a certain input sequence (often a sequence of characters) should be mapped to a replacement output sequence (also often a sequence of characters) according to a defined procedure.
A Supervisor Call instruction (SVC) is a hardware instruction in the System/360 family of IBM mainframe computers up to contemporary zSeries (as well as non-IBM mainframe computers such as the Amdahl 470/V5, 470/V6, 470/V7, 470/V8, 580, 5880, 5990M, and 5990A, and others; Univac 90/60, 90/70 and 90/80, and possibly others; and the Fujitsu M180 (UP), and M200 (MP), and others) used to cause an interrupt to request a service from the operating system.