GCSE Computing/Computer systems and programming

2.1 Unit A451: Computer systems and programming This topic introduces computer systems and provides a foundation for the remaining topics in this unit. Candidates should develop a mental model of a computer system which comprises hardware and software and in which: This model applies to the personal computer, but candidates should be aware of how it also applies to equipment which uses computer technology.
 * data is input and converted into the computer’s internal representation by input devices
 * the data is processed
 * the results of the processing are converted from the computer’s internal representation and output by an output device
 * the data may be stored for later use or transmitted to another computer system while it is still in the computer’s internal representation.

This unit is assessed in a 1.5 hour written exam paper and counts for 40% of the overall GCSE. It covers the following topic areas:
 * 2.1.1 Components of a Computer System
 * 2.1.2 Computing hardware
 * 2.1.3 Software
 * 2.1.4 Representation of Data in Computer Systems
 * 2.1.5 Database
 * 2.1.6 Computer Communications and Networking
 * 2.1.7 Programming