2. MS DOS
• MS-DOS is an operating system created for
personal computers. It was developed by
Microsoft.
• It is a classic example of an operating system
with a layered structure. MS-DOS operating
system is split into various layers and each of
the layers have different functionalities.
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5. • Layering provides a distinct advantage in the MS-
DOS operating system because all the layers can
be defined separately and interact with each
other as required.
• Also, it is easier to create, maintain and update
the system if it is done in the form of layers.
Change in one layer specification does not affect
the rest of the layers.
• However, the layers in MS-DOS are not that
sharply defined, and the layer specifications often
bleed into each other.
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17. The part of the operating system that receives
and executes operating system commands. Every
operating system has a command processor. When the
command prompt is displayed, the command
processor is waiting for a command.
After you enter a command, the command processor
analyzes the syntax to make sure the command is valid,
and then either executes the command or issues an
error warning. For operating systems with a graphical
user interface, the command processor
interprets mouseoperations and executes the
appropriate command.
Command Processor
18. Most computers are configured to boot from the
hard drive. With a simple change to the system
BIOS, you can tell your system to boot from a
floppy disk.
This is useful if you are having problems with your
operating system, if you have been infected with
a virus or having other problems booting your
computer. All Windows systems allow you to
create a bootable floppy just for these types of
situations.
Booting from floppy and Hard
Disk (HD)