TAILIEUCHUNG - Unit_6: Operating systems

When a brand new computer comes off the factory assembly line, it can do nothing. The hardware needs software to make it work. Are we talking about applications software such as word processing or spreadsheet software? Partly. But an applications software package does not communicate directly with the hardware. Between the applications software and the hardware is a software interface – an operating system. An operating system is a set of programs that lies between applications software and the computer hardware | Unit 6 Operating systems Task 1 Operating systems hidden software Read the text to find the answers to these questions 1. What difference is there between applications software and operating systems 2. Why is the supervisor program the most important operating system program 3. What is the difference between resident and non-resident programs 4. What are the main functions of an operating system When a brand new computer comes off the factory assembly line it can do nothing. The hardware needs software to make it work. Are we talking about applications software such as word processing or spreadsheet software Partly. But an applications software package does not communicate directly with the hardware. Between the applications software and the hardware is a software interface - an operating system. An operating system is a set of programs that lies between applications software and the computer hardware. The most important program in the operating system the program that manages the operating system is the supervisor program most of which remains in memory and is thus referred to as resident. The supervisor controls the entire operating system and loads into memory other operating system programs called nonresident from disk storage only as needed. An operating system has three main functions 1. manage the computer s resources such as the control processing unit memory disk drivers and printers 2. establish a user interface and 3. execute and provide services for applications software. Keep in mind however that much of the work of an operating system is hidden from the user. In particular the first listed function managing the computer s resources is taken care of without the user being aware of the details. Furthermore all input and output operations although invoked by an applications program are actually carried out by the operating system. Task 2 Complete the gaps in this summary of the text on operating systems using these linking words and phrases although .

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