CPU board Computer hardware includes the physical, tangible parts or components of a, such as the,,,,,,. By contrast, is instructions that can be stored and run by hardware. Hardware is so-termed because it is ' or rigid with respect to changes or modifications; whereas software is 'soft' because it can be easily. Intermediate between software and hardware is ', which is software that is strongly coupled to the particular hardware of a computer system and thus the most difficult to change but also among the most stable with respect to consistency of interface. The progression from levels of 'hardness' to 'softness' in parallels a progression of in computing. Hardware is typically directed by the to execute any command. A combination of hardware and software forms a usable system, although exist with only hardware components.

In electronic systems and computing, firmware is a tangible electronic component with embedded software instructions, such as a BIOS. Typically they are used to tell. Latest trending topics being covered on ZDNet including Reviews, Tech Industry, Security, Hardware, Apple. A computer is divided into three components: computer hardware, software and peopleware. A computer hardware is a physical part or component that make up a computer. It is categorized into three groups of devices and these are input, output and storage devices.

Von Neumann architecture scheme The template for all modern computers is the, detailed in a by Hungarian mathematician. This describes a design architecture for an electronic with subdivisions of a consisting of an and, a containing an and, a to store both data and, external, and mechanisms. The meaning of the term has evolved to mean a in which an instruction fetch and a data operation cannot occur at the same time because they share a common.

This is referred to as the and often limits the performance of the system. Types of computer systems [ ] Personal computer [ ]. Main article: The computer case encloses most of the components of the system. It provides mechanical support and protection for internal elements such as the motherboard, disk drives, and power supplies, and controls and directs the flow of cooling air over internal components. The case is also part of the system to control electromagnetic interference radiated by the computer, and protects internal parts from electrostatic discharge.

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Large tower cases provide extra internal space for multiple disk drives or other peripherals and usually stand on the floor, while desktop cases provide less expansion room. All-in-one style designs from, namely the, and similar types, include a video display built into the same case. Portable and laptop computers require cases that provide impact protection for the unit. A current development in laptop computers is a detachable keyboard, which allows the system to be configured as a touch-screen tablet. Hobbyists may decorate the cases with colored lights, paint, or other features, in an activity called.

Power supply [ ]. Main article: The motherboard is the main component of a computer.

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It is a board with integrated circuitry that connects the other parts of the computer including the, the, the disk drives (,,, or any others) as well as any peripherals connected via the ports or the. Components directly attached to or to part of the motherboard include: • The (central processing unit), which performs most of the calculations which enable a computer to function, and is sometimes referred to as the brain of the computer. It is usually by a heatsink and fan, or water-cooling system. Most newer CPUs include an on-die. The of CPUs governs how fast it executes instructions, and is measured in GHz; typical values lie between 1 GHz and 5 GHz. Many modern computers have the option to overclock the CPU which enhances performance at the expense of greater thermal output and thus a need for improved cooling.

• The, which includes the, mediates communication between the CPU and the other components of the system, including main memory. • (RAM), which stores the code and data that are being actively accessed by the CPU. For example, when a web browser is opened on the computer it takes up memory; this is stored in the RAM until the web browser is closed.