Archives: Theory

Storage Devices

What is a storage device? Storage devices are the computer hardware used to remember/store data. There are many types of storage devices, each with their own benefits and drawbacks. Below are explanations about different storage devices. Jump to a section on this…

Fetch Execute Cycle

The fetch execute cycle is the basic operation (instruction) cycle of a computer (also known as the fetch decode execute cycle). During the fetch execute cycle, the computer retrieves a program instruction from its memory.  It then…

Von Neumann Architecture

Von Neumann architecture was first published by John von Neumann in 1945. His computer architecture design consists of a Control Unit, Arithmetic and Logic Unit (ALU), Memory Unit, Registers and Inputs/Outputs. Von Neumann architecture is based on the stored-program computer concept,…

Data Storage Capacity

Data storage capacity is the measurement of how much data can be stored in a storage device. Bits, bytes and nibbles Data storage capacities are measured in bytes, where each byte is actually a pattern of 8…

Output Devices

What is an output device? Output devices are pieces of computer hardware used to communicate the results of data processing performed by a computer. The objective of output devices is to turn computer information into…

Input Devices

What is an input device? Input devices are peripherals used to provide data and control signals to a computer. Input devices allow us to enter raw data for processing. There are many examples of input…

Primary Key

A primary key is needed to provide a unique way to identify one record (row) from another within a database table. Fields marked as a primary key will not allow duplicate entries in that field…

Database Table

A database table (sometimes called a file) is a collection of records about the same entity (topic). Some databases contain just a single database table (called a flatfile database) whilst others may have many tables…

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