Archives: Theory

Serial and Parallel Data Transmission

Data transmission can occur in two modes (methods), either serial or parallel. Serial data transmission In serial data transmission, bits are sent sequentially (one after the other) down the same wire (channel). Using a single…

Phishing

Phishing is the attempt to gain personal and sensitive information (usernames, passwords, financial details) for a malicious purpose. Phishing scams usually involve the receipt of a spoof email where the criminal impersonates a trustworthy and…

Free Software, Freeware and Shareware

Computer software is subject to copyright laws in order to protect its authors and provide them with fair compensation for their hard work. Without payment, there would be no incentive for programmers to spend years…

Operating System

An operating system (OS) is the computer program (software) responsible for the operation and smooth running of a computer. Most general purpose computers (including smartphones and tablets) will have an operating system to manage the running of…

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 and bytes Data storage capacities are measured in bytes, where each byte is actually a pattern of 8 bits….

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