Using Computers for Personal Needs on Applying Computers

Used definitions

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To understand the operating principles of computer systems we use basic terms:

👤 User — a person or a group of people who interact with a computer to solve their tasks.
💻 Computer — an electronic device (or a related system of several devices) controlled by programs. Depending on the installed programs, its functions change so that it can be a useful tool for the user.
📊 Digital data — any information familiar to us (texts, photographs, music, or video) represented in a “language” the computer understands (binary code). Thanks to this representation, the computer can store, process, and transmit it.
⚙️ Program — a digital tool, a prepared set of commands for the computer. It is used to work with digital data in the way the user needs.
🛠️ Hardware components (“hardware”) — all physical parts (electronics, chips, boards) from which the computer is assembled.

Computers

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The choice of device(s) and programs depends on the user’s needs: the requirements are dictated by the tasks that will be performed with them.

When choosing a computer, characteristics may include:

programs;
required component power;
cost of system deployment;
energy consumption and maintenance cost;
form factor;
whether you already have these devices, or component compatibility with existing ones, and so on.

Understanding the task requirements allows better system optimization in terms of resources spent on deployment, use, maintenance, and/or scaling.

Programs

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Programs make it possible to use a computer’s hardware components to perform the user’s digital operations.

A device’s software consists of several levels. This is necessary for compatibility among various kinds of programs and hardware components. It usually operates on three interrelated levels.

Principles of computer computation

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Electrical voltage can be used to transmit digital values.

Abstractly:

there is voltage (higher voltage) = on state = 1;
no voltage (lower voltage) = off state = 0.

This fully fits the mathematical binary numeral system. In it, each digit can be only zero or one, and grows in values as powers of two.

Principles of network connectivity

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Connectivity between computers is possible by means of network protocols.

Large blocks of data are not transmitted as a continuous stream. Using information exchange protocols, they are divided into smaller parts (packets) for transport, and after successful receipt on the target device they are reassembled into the original form.

Virtualization

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Virtualization of computing resources makes it possible to run isolated environments on shared physical hardware.

This chapter will be expanded.

Designing computers

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Technologies offer enormous variability at every stage of creating a system.

7.1. Choosing a computer

It is determined which device (or combination of devices) best matches the user’s task.

One powerful computer vs several specialized ones: sometimes it is more appropriate to distribute the task among several simpler devices than to seek one universal device.

Assembling computers

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Assembly is the process of physically combining separate parts (hardware components) into a single working computer.

All computers work by similar principles, but their parts may differ in size, power, and compatibility. The best example of a computer assembled like a construction set is the classic desktop PC.

Configuring computers

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This process goes step by step “from the bottom up” — from basic equipment commands to creating a convenient work screen.

9.1. Basic equipment configuration (Firmware / BIOS / UEFI)

This is the very first level. When you press the power button, even before the system itself starts, the motherboard’s basic “firmware” is activated.

Maintaining computers 🛠️

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Even a perfectly assembled system over time accumulates dust, gets clogged with software “junk,” and wears out.

10.1. Physical (hardware) maintenance

Aimed at supporting the condition of the components themselves.

Fighting dust — dust works like a warm blanket. If heatsinks are clogged, the processor overheats and deliberately slows down (throttling). Regular careful cleaning returns speed.
Thermal paste replacement — between the processor and the heatsink a special paste helps transfer heat. Over the years it dries out, so it periodically (once every few years) needs to be renewed.
Modernization (upgrade) — often it is enough to add RAM or replace an HDD with an SSD for the device to work noticeably faster.

10.2. Software maintenance (system hygiene)

Updates — regular installation of OS and program updates. This is like vaccination: developers close security holes and improve performance.
Digital cleaning — deleting temporary files, old downloads, and unused programs. This frees disk space and improves stability.

10.3. Data preservation (backup)

Any physical part will eventually break, or the device may be stolen. Specialists use the golden backup rule “3-2-1”: