# Read e-book online Cambridge IGCSE Computer Science PDF

By David Watson, Helen Williams

ISBN-10: 1471809307

ISBN-13: 9781471809309

Counseled through Cambridge foreign Examinations. strengthen your scholars computational pondering and programming talents with entire assurance of the newest syllabus from skilled examiners and lecturers. - Follows the order of the syllabus precisely, making sure entire assurance - Introduces scholars to self-learning routines, supporting them find out how to use their wisdom in new eventualities Accompanying animation documents of the major techniques can be found to obtain at no cost on-line. See the fast hyperlinks to the left to entry. This ebook 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 students taking the recent desktop technology AS point path (9608).

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Extra info for Cambridge IGCSE Computer Science

Example text

The value 0000 0000 is ignored in this calculation. Example 3 explains how a checksum is generated. Example 3 If the sum of all the bytes in the transmitted block of data is <= 255, then the 38 checksum is this value. 15. 629 2 Rounding down to nearest whole number gives Y = 4 3 Multiplying by 256 gives Z = Y * 256 = 1024 4 The difference (X – Z) gives the checksum: (1185 – 1024) = 161 5 This gives the checksum = 161 When a block of data is about to be transmitted, the checksum for the bytes is first of all calculated.

This chapter has described in detail some of the fundamental theories used in logic circuit design. This will give the reader sufficient grounding to cover all existing (I)GCSE and O level syllabuses. However, it is worth finally discussing some of the more advanced aspects of logic circuit design. Electronics companies need to consider the cost of components, ease of fabrication and time constraints when designing and building logic circuits. We will mention two possible ways electronics companies can review logic circuit design: 1 One method is to use ‘off-the-shelf’ logic units and build up the logic circuit as a number of ‘building blocks’.

2 Internet Protocol (IP) Address Each device on the internet is given a unique address known as the INTERNET PROTOCOL (IP) ADDRESS. 1 A home computer is given an IP address when it connects to the internet. This is assigned by the ISP and is unique for that particular internet session. The only IP 40 addresses that remain fairly unchanged are web servers. An IP address can be used instead of typing in the full URL. 1 would take you straight to the device corresponding to this address. IP addresses and MAC addresses You will recall the term MEDIA ACCESS CONTROL (MAC) ADDRESS from Chapter 1.