Archives: Theory

Iteration

Iteration is the term given to the repetition of a block of statements (code) within a computer program. Basically, think loops! There are 3 types of iteration that you need to learn for GCSE: FOR .. TO…

Synchronous and Asynchronous

Synchronous and Asynchronous transmission are two methods (protocols) of keeping data synchronised when transmitted. Asynchronous data transmission Data is transmitted in discrete packets (usually 1 byte) Each packet of data is sent with control bits The…

Data Transmission

Data transmission is the movement of data (bits) between at least two digital devices. Data transmission can be over a short distance (e.g. from your computer to a plugged in device) or over longer distances (e.g….

Translators

Computers only understand machine code (binary), this is an issue because programmers prefer to use a variety of high and low-level programming languages instead. To get around the issue, the high-level and low-level program code (source code) needs…

Converting Hexadecimal to Binary

The video below gives a step by step guide on how to convert hexadecimal to binary. Here’s how it works: Change any hexadecimal letters into their decimal equivalents. Work out the 4 bit binary code for each…

Converting Binary to Hexadecimal

The video below gives a step by step guide on how to convert binary code into hexadecimal. Here’s how it works: From right to left, split the binary code into groups of 4 bits. Write…

Converting Hexadecimal to Decimal

The video below gives a step by step guide on how to convert hexadecimal values into a decimal (denary) number. Here’s how it works: Write the correct base 16 headings above the hexadecimal values. Convert any letters (A…

Converting Binary to Decimal

The video below gives a step by step guide on how to convert binary code into a decimal (denary) number. Here’s how it works: Write the correct base 2 headings above the binary code. Add…

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