Download Cambridge IGCSE Computer Science by David Watson, Helen Williams PDF

By David Watson, Helen Williams

Recommended by way of Cambridge foreign Examinations. enhance your scholars computational pondering and programming talents with whole insurance of the newest syllabus from skilled examiners and academics. - Follows the order of the syllabus precisely, making sure entire insurance - Introduces scholars to self-learning routines, aiding them the right way to use their wisdom in new situations Accompanying animation records of the most important recommendations can be found to obtain at no cost on-line. See the fast hyperlinks to the left to entry. This booklet covers the IGCSE (0478), O point (2210) and US IGCSE access (0473) syllabuses, that are for first exam 2015. it might probably even be an invaluable reference for college kids taking the hot computing device technological know-how AS point direction (9608).

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It is clear that the number of possible binary combinations is a multiple of the number 2 in every case. 1 Find out why and both represent the same logic gate. (Note: the three symbols in the Boolean algebra have the following meaning: . g. 5 Logic circuits When logic gates are combined together to carry out a particular function, such as controlling a robot, they form a logic circuit. The output from the logic circuit is checked using a truth table. There now follows three examples which show: • how to produce a truth table • how to design a logic circuit from a given logic statement/Boolean algebra • how to design a logic circuit to carry out an actual safety function.

43 3 Logic gates and logic circuits In this chapter you will learn about: • logic gates • truth tables • logic circuits • use of Boolean algebra. 1 Introduction 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. The checking of the output from a logic gate or logic circuit is done using a TRUTH TABLE.

The use of 8-bit, 16-bit, 32-bit and 64-bit buses, for example, allow much faster data transmission rates than could be achieved with single channel serial data transfer. 3) and the short distances between components mean that none of the issues described earlier have any real impact on the accuracy of the data. Chapter 4 covers the internal architecture of computer systems (including the role of buses) and this should be read in conjunction with the information given above. 3 Asynchronous and synchronous data transmission ASYNCHRONOUS DATA TRANSMISSION refers to data being transmitted in an agreed bit pattern.

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