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LESSON 13
OPERATING SYSTEMS

PART 1

Task 1. Learn the following words and word combinations:
Application code, video game console, share roots, a real-time
operating system, real-time applications, predictable, a multi-user
operating system, single-user operating systems, a multi-tasking
operating system, a single-tasking system, a distributed operating
system, embedded operating systems.

Task 2. Make up your own sentences using words and phrases
from the previous exercise.

TEXT 1
TYPES OF OPERATING SYSTEMS
An operating system (OS) is a collection of software that
manages computer hardware resources and provides common
services for computer programs. The operating system is a vital
component of the system software in a computer system. Application
programs usually require an operating system to function.
Time-sharing operating systems schedule tasks for efficient use
of the system and may also include accounting for cost allocation of
processor time, mass storage, printing, and other resources.
For hardware functions such as input and output and memory
allocation, the operating system acts as an intermediary between
programs and the computer hardware, although the application code
is usually executed directly by the hardware and will frequently
make a system call to an OS function or be interrupted by it.
Operating systems can be found on almost any device that contains a

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