Pages in this set

Page 1

Preview of page 1

ALU - performs the calculations on the data.
Control Unit - controls all of the operations inside the computer.
Register ­ stores a single item of data.

RAM - is the type of memory used for temporarily storing programs and data.
· Volatile ­ the data…

Page 2

Preview of page 2

o Portability: very portable due to size
o Use: portable data transfer

Analogue\ Digital:
1. Difference - analogue is a continuous varying signal and digital consists of discrete bit patterns
2. Computers are digital and analogue signals such as temperature\ voice need converting
to digital for processing

Hand Shaking…

Page 3

Preview of page 3

VoIP (Voice over Internet Protocol) - used for sending voiced messages over the Internet.
WAP (Wireless Application Protocol) - enables the transmission of data over a wireless network.

Wireless Networks:

Hardware ­ Wireless Router\ Wireless network card

No need for cabling.
Computers can be used anywhere within range…

Page 4

Preview of page 4

2. A new master file is created and copied across
3. Data that needs updating is updated from transaction to master file
4. New master file replaces the old master file
ensure data is consistent
ensure data have not been corrupted
Carried out when d_ata is being entered…

Page 5

Preview of page 5

Data can be accessed speedily and manipulated to form new data
A single database can be shared, internationally if need be
Data duplication can be avoided
Security of data can be centralised

Centralised data can be easier to steal than decentralised data
If data is not correct, it…

Page 6

Preview of page 6

Variable: A name used to refer to a memory location used to store data. The value can be changed
when the program running.

Global Variable:
Declared at the beginning of the program and is available throughout the code, including all
Local Variable:
Declared and used inside only one…

Page 7

Preview of page 7

· Initialising Variables
· Annotation

Levels of Languages:
Machine Code
1. Consists of a series of zeroes and ones to make up both instructions and data.
2. Processed by all computers,
3. Very difficult for people to learn
4. Prone to difficult-to-detect errors

Assembly Language
1. One assembly language…

Page 8

Preview of page 8

1. It is much faster to send a message (seconds instead of days)
2. It is cheaper - there are no extra charges for sending emails
3. One message can be sent to a number of people.
4. You can send 'attachments' - pictures; sounds; video clips etc…

Page 9

Preview of page 9

Example: Pay roll system ­ All hours worked are stored up and processed at the end of the
Example: Electricity bill system ­All the meter readings from premises that use electricity are
collected together and processed as a batch.
Real Time Processing:
1. data received by the computer…

Page 10

Preview of page 10

Direct ­ Changing over to new one immediately
Advantage: Not very costly
Disadvantage: Could be disastrous if there are errors in the new system

Parallel ­ Running both systems together until no issues
Advantage: no disasters if there are errors in the new system
Disadvantage: a lot of duplication…


No comments have yet been made

Similar Computing resources:

See all Computing resources »