IBM 5150 Manual To Operations page 77

Introduction
DOS stands for Disk Operating System. People are about
evenly divided between saying d -
0 -
s or as one word,
doss (to rhyme with hoss).
DOS is a collection of programs for your IBM Personal
Computer that is supplied to you on the DOS Diskette.
These programs process commands to let you manage
information. They also help you manage the hardware
resources (for example, the diskette drives and screen)
of your computing system. DOS also does some stuff
inside the machine, but since it does it for you, we won't
describe it in this chapter.
This chapter tells you about starting DOS, about the
diskettes and making a copy of the DOS Diskette.
Then we will step you through examples of the DOS
commands you will use most often. After you've
learned how to use these commands, you will probably
want to refer to the IBM Personal Computer Disk
Operating System book for more information on these
and other commands, and on other DOS programs.
It is important that you copy your DOS Diskette. In
fact, we suggest you do it several times. See "An
Important Exercise" for instructions.
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DOS
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