SS1 Second Term Computer Studies Lesson Note – Computer System Software II

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WEEK 3                                                                                

TOPIC:  COMPUTER SYSTEM SOFTWARE (cont’d)

CONTENT: 

1. Examples of Operating Systems
2. Examples of Translators and Utility programs

SUB-TOPIC 1:  OPERATING SYSTEM:

 Computers require an operating system (OS) to work. The operating system is a group of programs that manage the computer system resources, including the data in main memory and in auxiliary storage. It is the most important piece of software in a computer system. A computer’s operating system (OS) is the systems software that allows all the dissimilar hardware and software components to work together. It consists of a set of programs that manages all the computer’s resources, An OS provides services that are needed by applications and software, such as reading data from a hard disk. Parts of an OS may be permanently stored in a computer’s ROM.

The operating system has three major functions:

1. It coordinates and manipulates computer hardware, such as computer memory, printers, disks, keyboard, mouse, and monitor
2. It organizes files on a variety of storage media, such as floppy disk, hard drive, compact disc, digital video disc, and tape; and
3. It manages hardware errors and the loss of data.

General examples of operating systems

1. Microsoft Windows: 95, 98, 2000, ME, XP, NT, Vista, 7, 8, 10, Windows NT, Windows server 2003
2. Unix: Linux, Ubuntu,
3. MS-DOS,
4. Symbian,
5. XENIX,
6. Novel Netware, etc

Types of Operating System:

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