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AS Computing F451 Revision Notes



REVISION NOTES FOR MODULE F451 - COMPONENTS OF A
COMPUTER SYSTEM AND MODES OF USE
This document provides you with a series of definitions based on past mark schemes. Every point in each definition
has appeared in at least one mark scheme in the past.…

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AS Computing F451 Revision Notes


Tele-work (AKA tele-working).
Legislation
General principles:
Computer Misuse Act
Copyright, Designs and Patents Act
Data Protection Act:
Health and Safety At Work Act
Display Screen Equipment Regulations
Social and Moral
Changes in Work Patterns
Situations caused by the introduction of a new system:




F451 Revision…

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AS Computing F451 Revision Notes


COMPONENTS OF A COMPUTER SYSTEM
Hardware ­ the physical components that make up a computer system.

Software ­ programs and data (groups of instructions to the CPU) used to make the hardware work/produce useful
results.

System software - Systems software controls the hardware/makes the system…

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AS Computing F451 Revision Notes



Hard disk - stores files/software/operating system.

Floppy disk - stores backups of important files to transfer work between machines.

CD-ROM and DVD-ROM - used to import software, store encyclopaedia /databases /video /music /films /backup
files. Always include the suffix when talking about optical disks

CD-RW…

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AS Computing F451 Revision Notes



Data transfer using buffers (e.g. from primary memory to secondary storage) - data sent to buffer from primary
memory. Interrupt sent when buffer is full, buffer is then emptied to storage device, at slower speed, to
accommodate device. CPU continues on other work. When buffer…

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AS Computing F451 Revision Notes


SOFTWARE AND OPERATING SYSTEMS
Software - when answering questions on software, do not refer to brand names or trademarks. You should use
generic names (given in descriptions below: word processor, spreadsheet, operating system, etc) and not use words
like Windows, Word, Excel, PowerPoint, Photoshop, Coral…

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AS Computing F451 Revision Notes



GUI - a graphical user interface. WIMP - uses windows, icons to represent available programs and programs, menus
and pointers. Advantages: easy to use, icons show representation of options.
Menu interface - presents the user with a range of choices, choices may provide a range…

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AS Computing F451 Revision Notes


Barcode - patterns of light/dark lines, pairs of which store digits. Barcodes used to store ID code/used to
access record on file. Different widths/pairs of widths used. Inclusion of check digit for automatic checking.
Start and stop codes allow bars to be read both ways.…

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AS Computing F451 Revision Notes




FILE ORGANISATION
Fixed length records - all records are the same length, regardless of the data stored. Limit on the amount of data that
can be stored.

Key field - a field within a record which uniquely identifies a record (e.g. student_admission_number is unique to…

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AS Computing F451 Revision Notes



NETWORKING
NETWORKING
Network - linking two or more computers (or peripheral devices) to allow them to communicate.

Advantages of networking - network manager has control over network, can monitor use of resources. Shared
physical resources (e.g. hardware), software and files. Allows communications across the network…

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