Discuss any 3 functions of operating systems.(9 marks)2. Discuss any 3

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Discuss any 3 functions of operating systems.(9 marks)2. Discuss any 3
factors affecting the choice of an operating systems.(9 marks)3. Discuss
the following types of operating systems.„Ï Multi tasking

Assignment 9

1. Discuss any 3 functions of operating systems.
(9 marks)

2. Discuss any 3 factors affecting the choice of an operating
(9 marks)

3. Discuss the following types of operating systems.
- Multi tasking
- Multi processing
- Multi user
- Real time
(12 marks)

1. 3 functions of operating systems are as follow:
a) Manage the computer resources such as central processing unit,
memory, disk drives and printer. In other words it acts like a
translator which allows the application software to communicate with
the computer hardware.

b) Caretaker which making sure that date is saved in the right place,
programs are loaded into memory properly and that the computer's
filing system is all kept in order.

c) Execute and provide services for applications software in other
words as system tools (programs) used to monitor computer performance,
debug problems, or maintain parts of the system. A set of libraries or
functions which programs may use to perform specific tasks especially
relating to interfacing with computer system components.

2. 3 factors affecting the choice of an operating system are as

a) Choice of processor and hardware for example if server machine is a
Sun computer then will be forced to use Solaris which is Sun's version
of UNIX.

b) A hardware or software protocol, contained in the electronics of
the disk controller and disk drive, that manages the exchange of data
between the drive and computer. The most common interfaces for small
computer systems are AT (IDE) and SCSI.

c) Compatibility of computer networks types including LANs and WANs,
for example UNIX and Window NT are usually use to become the mainframe
of WANs networking system.

a)Multi tasking - In a multitasking operating system where multiple
programs can be running at the same time, the operating system
determines which applications should run in what order and how much
time should be allowed for each application before giving another
application a turn. Examples of multi tasking operating system are
UNIX and Window 2000.

b)Multi processing - An operating system capable of supporting and
utilizing more than one computer processor for example Linux, UNIX,
Windows 2000.

c)Multi user - A multi user operating system allows for multiple users

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to use the same computer at the same time oe in different times for
example Linux, UNIX, windows 2000.

d)Real time - A real-time operating system (RTOS) is an operating
system that guarantees a certain capability within a specified time
constraint. For example, an operating system might be designed to
ensure that a certain object was available for a robot on an assembly
line, such as Windows 2000 or IBM's OS/390.

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SUBJECT: Marked!


Q1. 9
Q2. 9
Q3. 12

Total: 30/30

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