Computer Features and Classification (Grade 11 NSC Matric Computer Application Technology): Revision Notes
Computer Features and Classification
Introduction to computer classification
Understanding the different types of computers helps us choose the right device for specific tasks. Computers can be organised into three main categories based on their design and intended use:
- Non-portable devices: These include servers and desktop computers that stay in one location
- Portable devices: These include laptops, tablets, and smartphones that can be easily moved around
- Dedicated devices: These are specialised computers built into everyday objects like ATMs and smart fridges
These devices are classified according to three key factors: how portable they are, their processing power, and what they are primarily used for.
Key Concept: The Power-Portability Trade-off
Generally, there's a trade-off between processing power and portability - the more powerful a device is, the less portable it tends to be.
Computer classification
Servers
Servers are the powerhouses of the computing world. Their primary purpose is to serve information to other computers and users over a network. They're designed to handle massive amounts of data quickly and efficiently, which requires extremely high processing power.
Data Centres and Server Networks
Servers are typically connected to each other in networks and housed in special rooms called data centres. Removing a server would stop it from functioning properly as part of the network.
Servers are not portable at all - they're designed for permanent installation in network environments. Think of servers as the engines that power websites, online games, and cloud storage services that millions of people use every day.
Desktop PCs
Desktop personal computers are designed for general office work and household activities. They excel at tasks like gaming, photo and video editing, budgeting, and web browsing. Desktop PCs can be extremely powerful, especially those built for gaming or heavy computational work.
However, desktop PCs are not very portable because they're large and heavy. They have delicate internal components and require an external power source to function. This makes them ideal for situations where you need high performance but don't need to move the computer around.
Laptops and notebooks
Laptops represent a balance between power and portability. They're generally used for office work or personal tasks and are often called "mid-range devices" because their processing power falls between desktop computers and smaller devices.
The key advantage of laptops is their portability - they contain a built-in battery so you don't always need to be plugged into a power source. Many modern laptops are surprisingly lightweight, with some models like the ASUS Zenbook being extremely thin and light whilst still providing good performance.
Tablets
Tablets are primarily designed for entertainment and web browsing rather than heavy computing tasks. Their processing power is not very high compared to computers and laptops, which makes them perfect for activities like watching videos, reading, playing casual games, and browsing social media.
Mobile Computing
Tablets are highly portable because they're designed to be mobile devices. They play an important role in mobile computing, which refers to the ability to use computing technology whilst moving around.
The touchscreen interface makes them intuitive to use without needing a separate keyboard or mouse.
Smartphones
Smartphones are designed primarily as communication devices, though modern smartphones can do much more than just make calls and send messages. They come with pre-installed messaging and voice-call applications, plus access to app stores where you can download additional software.
While smartphones have some processing power, they're not designed to be high-powered computing devices. However, they're extremely portable, representing the perfect blend of ultra-portable computing and mobile technology. You can literally carry a smartphone anywhere and use it for basic computing tasks on the go.
Dedicated devices
Computers aren't just the obvious devices like phones and laptops - they're actually everywhere around us, even in places we might not expect. You can find computers in ATMs, point-of-sale devices (like shop tills), card machines, and even household appliances like fridges and air-conditioners.
Understanding Embedded Systems
These computers are called dedicated devices or embedded devices because they're built into other objects to perform very specific functions. Their components vary depending on what they're installed in, but most have some kind of display (either a screen or LED lights) and an input device (like a keypad or remote control).
Dedicated devices are usually quite limited in what they can and cannot do, as they're designed to perform very specific functions rather than general computing tasks.
Smart devices
In recent years, "smart devices" have become increasingly popular and widely available. These devices are designed to connect with each other and the internet to make life easier for users. Smart devices represent the evolution of dedicated devices, adding connectivity and intelligence to everyday objects.
ATMs (Automated Teller Machines)
ATMs are electronic banking systems that allow customers to perform banking functions without needing to visit a physical bank branch. You can use ATMs to draw and deposit money, pay bills, and apply for loans. Since ATMs are designed to only perform banking functions, they're classified as dedicated devices.
Evolution Example: Cryptocurrency ATMs
An interesting development is the emergence of cryptocurrency ATMs, particularly Bitcoin ATMs. With the growing popularity of cryptocurrencies like Bitcoin, there's now a new generation of ATMs that can handle cryptocurrency transactions. These Bitcoin ATMs allow users to buy and sell Bitcoin and other selected cryptocurrencies, showing how dedicated devices evolve to meet new technological needs.
Smart fridges
Smart refrigerators represent the cutting edge of kitchen technology. These fridges have touchscreens and can connect to the internet using Wi-Fi, making them much more than just food storage devices.
Smart fridges can customise temperatures in different compartments, track expiry dates of food items, alert you when to use food before it expires, and create grocery lists that sync with your smartphone. Different brands offer different features, but they all aim to make food management more convenient and efficient.
Embedded Device Classification
The computers inside smart fridges are called embedded devices because they're built into the appliance rather than being separate computing devices.
Key Points to Remember:
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Computers are classified into three main categories: non-portable (servers, desktops), portable (laptops, tablets, smartphones), and dedicated devices (ATMs, smart appliances)
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There's generally a trade-off between processing power and portability - more powerful devices tend to be less portable and vice versa
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Dedicated devices are specialised computers built into everyday objects to perform specific functions, and they're everywhere around us
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Smart devices represent the evolution of dedicated devices by adding internet connectivity and the ability to interact with other devices
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Each device type serves different needs - choose based on whether you need maximum power, maximum portability, or specific dedicated functions