Desktop Background Images Free Photos Pictures Images 2013
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Biography:
A desktop computer is a personal computer in a form intended for regular use at a single location, as opposed to a mobile laptop or portable computer. Early desktop computers are designed to lie flat on the desk, while modern towers stand upright. Most modern desktop computers have separate screens and keyboards.Prior to the widespread use of microprocessors, a computer that could fit on a desk was considered remarkably small. Early personal computers, like the IBM PC, were "desktop" machines, with a horizontally oriented computer case, usually intended to have the display screen placed on top to save space on the desktop. In modern usage the word "desktop" usually refers to tower cases that are in fact more often located on the floor under the desk than on a desk.Technically speaking desktop and tower computers are two different styles of computer case that use desk space in varying ways.[original research?] Cases intended for home theater PC systems are usually considered to be desktop cases in both senses, regardless of orientation and placement.
Early computers took up the space of a room. Minicomputers generally fit into one or a few refrigerator sized racks. It was not until the 1970s when computers such as the HP 9800 series desktop computers were fully programmable computers that fit entirely on top of a desk. The very first large "programmable calculators/computers" (machines lacking keyboards for text input) were marketed in the second half of the 1960s, starting with Programma 101 (1965)
and HP 9100 (1968). More desktop models were introduced in 1971, leading to a model programmable in BASIC in 1972. They used a smaller version of a minicomputer design based on read-only memory (ROM) and had small one-line LED alphanumeric displays. They could draw computer graphics with a plotter. The Wang 2200 of 1973 led operating systems such as Mac (Macintosh) and Windows.An operating system (OS) is the program that after being initially loaded into the computer by a boot program, manages all the other programs in a computer.
Most of today's desktop computers have one of the three major operating systems available. In order of usage share, they are Windows, OS X, and Linux. Microsoft Windows and Linux can be used for almost any desktop computer. Although Apple OS X can be used on some computers that are not Apple branded, the legality of this is currently disputed. OS X has been designed by Apple to only work on Apple computers unless you have an EFI emulator which creates an environment that can boot OS X on a regular PC.
New versions of each of these operating systems are released on a semi-regular basis. The newest version of Microsoft Windows is called Windows 8. The newest version of OS X is OS X Mountain Lion. Linux is available in multiple distributions, the more popular being Ubuntu, Linux Mint, Fedora and openSUSE. Each distribution is typically free, has its own version number and bundled software, but all distributions of Linux contain a Linux kernel.
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
Desktop Background Images Free Photos Pictures Images 2013
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