System S Oftw Are; The Operating System; 2. Run-Time Interpreter Routines - NCR PC4i Owner's Manual

1. System — operating systems, run-time interpreters and utilities.
2. Program development — editors, compilers, assemblers, and
linkers.
3. Application — payroll, billing, games, word processing, etc.
Programs are written in a language called a source language. The file
created by entering source language instructions into the computer is
referred to as source code. Depending on the source language used, the
source code may be translated by a compiler or assembler which then
produces the object code. The object code is usually machine-language
code (the language understood by the CPU). On some computers, the
object code is directly executable. Othertimes, the object code
requires further processing by a linker into an executable load
module which the CPU and the operating system can use.
System Software
System software are standard programs whose presence is essential
for your computer to operate. They consist of:
1. Operating system program — control programs that permit and

2. Run-time interpreter routines.

3. Utility programs.
Some manufacturers supply not only a primary operating system
with the hardware, but any necessary run-time interpreters, and a
comprehensive set of utility programs. You may want to obtain
multiple operating systems. A great variety of software is available to
you from either the manufacturer (or dealer) or retail software
development companies.

The Operating System

The operating system provides an orderly link between the hardware
and software of a computer system. It is a program, or a collection of
programs, that control all other programs in the computer, allocate
the computer's resources (memory, disk space, printer, etc.) and
prepare the computer to accept the commands or instructions of other
programs.
OWNER S MANUAL
initiate the running of all other
kinds of programs, such as appli­
cation programs.
HISTORICAL DATA
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