System Unit - IBM 5155 Manual To Operations

System Unit
The main component of your IBM Portable Personal
Computer is the system unit. It accomplishes all of the
processing and controlling operations for your system
through a set of instructions called a program. The
IBM Portable Personal Computer comes with the
programming language, "IBM BASIC," already
installed, and most programs are written in that
language. However, you also can write programs for
your IBM Portable Personal Computer in several other
IBM supported programming languages. Although a
reference manual for IBM BASIC is included with your
system unit, prior knowledge of general programming
concepts is very helpful for writing programs for your
IBM Portable Personal Computer. In addition, various
program packages are available at your Authorized IBM
Personal Computer Dealer to satisfy a variety of your
business and personal needs.
The system unit stores data on the diskette drive using
an operating system, such as the IBM Disk Operating
System (DOS). IBM DOS allows the system unit to
store and retrieve data from the diskette drive. The
DOS reference manual and the IBM BASIC manual
explain the commands needed to store or retrieve data.
If you choose to write your own operating system, the
IBM Personal Computer XT Technical Reference
manual (PIN 6936808)
will
be helpful in providing the
necessary information.
System Unit 3-5