Apple IIe - Page 26

26 Apple lie Users Handbook
Operating Systems
An operating system can be defined as a group of programs
which manage the overall ~ operation of the computer . The
operating system performs system operations such as controlling
data input/output , memory assignments, etc.
The standard
operating system supplied with the lie with a disk
drive is DOS 3. 3. DOS stands for disk operating system.
There are several
other operating systems available for the lie .
The most
well-known of these is CP/M . To install CP/M, a Z80
peripheral card must be installed in slot 7 of the I le. The Z80 card
contains a Z80 microprocessor. The
Z80 is necessary to run
CP/M .
Language Translators
Programs are generally written in a high-level language that is
different from the instructions the computer uses. A program
known as a language translator must be used to translate the
high-level language into ' a form that the computer can compre-
hend .
There are
three categories of language translators: interpreters,
compilers,
and assemblers.
A compiled language program consists of the source code and
the compiled code. The source code consists of the program
statements in their original form. For example, the following is a
line of source code from a program written in the CBASIC
compiled language:
100 INPUT " ENTER TODAY'S DATE : "; DATE.1
The source
code is processed by a program known as a compiler
into the compiled code. The compiled code is very similar to the
machine language used by the microprocessor. The compiled
code is the code actually used when a compiled program is run .
A
program known as a run-time monitor is used to run the
compiled program . s