Cambridge IGCSE O-LEVEL-Computer Science Book . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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This textbook has been written to provide the knowledge, understanding and practical skills that a student would need for the Cambridge International Examinations Computer Science IGCSE and GCE O Level courses.
Binary systems Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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As you progress through this book you will begin to realise how complex computer
systems really are. By the time you reach Chapter 12 you should have a better
understanding of the fundamentals behind computers themselves and the software that
controls them
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The HEXADECIMAL SYSTEM is very closely related to the binary system. Hexadecimal
(sometimes referred to as simply "hex") is a base 16 system and therefore needs to
use 16 different "values" to represent each digit.
Data transmission Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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Data transmission can be either over a short distance (for example, from computer to
printer) or over longer distances (for example, over a telephone network).
Essentially, three factors need to be considered when transmitting data (each factor
has to be agreed by both sender and receiver for this to work without error):
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Keeping data safe is extremely important for a number of reasons. It may be personal
data that you want to keep within your family or your close friends, or commercial
data, such as passwords and bank account details, which need to be kept safe to
protect your money.
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When data is sent from one device to another, it is important to consider how that
data is transmitted. It is also important to ensure that the data hasnt been changed in
any way.
The internet has now become an integral part of all of our lives. This chapter will
consider some of the important technologies going on in the background which
support the internet.
Logic gates and logic circuits Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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Electronic circuits in computers, many new memories and controlling devices are
made up of thousands of LOGIC GATES. Logic gates take binary inputs and produce a
binary output. Several logic gates combined together form a LOGIC CIRCUIT and these
circuits are designed to carry out a specific function.
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All modern computers have some form of operating system which users generally
take for granted. The operating system makes it possible to communicate with the
software and hardware that make up a typical computer system.
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Computer systems would be of little real use without a method of input or output.
This chapter reviews how a number of input and output devices work. It also
considers a variety of applications which make use of these devices.
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Computer systems would be of little real use without a method of input or output. This chapter reviews how a number of input and output devices work. It also considers a variety of applications which make use of these devices.
Memory and data storage Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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There are many file formats used to store data, be this text, images or sound, in
computer systems. This chapter will consider how file compression is used to save
memory when storing different types of files.
All computer systems have primary memory and secondary memory storage. The
main technologies used are magnetic, optical and solid state. Storage devices which
use each of these technologies will be described later in this chapter, together with a
number of applications.
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All modern computers have some form of operating system which users generally
take for granted. The operating system makes it possible to communicate with the
software and hardware that make up a typical computer system.
High- and low-level languages Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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People use many different languages to communicate with each other. In order for
two people to understand each other they need to speak the same language or another
person, an interpreter, is needed to translate from one language to the other language.
Programmers use many different programming languages to communicate with
computers. Computers only "understand" their own machine code. A program needs
to be translated into machine code before it can be "understood" by a computer.
Ethics Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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Keeping data safe is extremely important for a number of reasons. It may be personal
data that you want to keep within your family or your close friends, or commercial
data, such as passwords and bank account details, which need to be kept safe to
protect your money.
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An ALGORITHM sets out the steps to complete a given task. This is usually shown as
a flowchart or pseudocode. Anyone who studies the flowchart or algorithm should be
able to work out the purpose of the task.
Practical problem-solving and programming Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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In order to build a computer system that performs a specific task or solves a given
problem, the task or problem has to be clearly defined, showing what is going to be
computed and how it is going to be computed. This chapter introduces the tools and
techniques that are used to design a software solution that together with the
associated computer hardware will form a computer system.
Databases Cambridge IGCSE O-LEVEL-Computer Science Topic wise past papers and solution . The Complete Cambridge IGCSE O-LEVEL-Computer Science Developer Course 2023 Videos.
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A DATABASE is a structured collection of data that allows people to extract
information in a way that meets their needs. The data can include text, numbers,
pictures: anything that can be stored in a computer