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desktop replacement computer
A desktop replacement computer (DTR) is a personal computer that provides the full capabilities of a desktop computer while remaining mobile. They are often larger, bulkier laptops or in some cases 2-in-1 PCs with a tablet-like form factor and interface. Because of their increased size, this class of computer usually includes more powerful components and a larger display than generally used in smaller portable computers and can have a relatively limited battery capacity (or none at all). Some use a limited range of desktop components to provide better performance at the expense of battery life. These are sometimes called desknotes, a portmanteau of the words "desktop" and "notebook", though the term is also applied to desktop replacement computers in general.〔(Desktop notebooks stake their claim ), accessed April 2010〕
==Origins==
The forerunners of the desktop replacement were the portable computers of the early to mid-1980s, such as the Osborne I,〔(Osborne 1 - The First Portable Computer from 1981 ), accessed April 2010〕 Kaypro II, the Compaq Portable〔(Compaq Portable, the Company's First Product in 1982 ), accessed April 2010〕 and the Commodore Executive 64 (SX-64) computers.〔(Commodore SX-64 portable computer ), accessed April 2010〕 These computers contained the CPU, display, floppy disk drive and power supply all in a single briefcase-like enclosure. Similar in performance to the desktop computers of the era, they were easily transported and came with an attached keyboard that doubled as a protective cover when not in use. They could be used wherever space and an electrical outlet were available, as they had no battery.
The development of the laptop form factor gave new impetus to portable computer development. Many early laptops were feature-limited in the interest of portability, requiring such mobility-limiting accessories as external floppy drives or clip-on trackball pointing devices. One of the first laptops that could be used as a standalone computer was the EUROCOM 2100 based on Intel's 8088 CPU architecture, it duplicated the functionality of the desktop models without requiring an external docking station.
The development of the modern desktop replacement computer came with the realization that many laptops were used in a semi-permanent location, often remaining connected to an external power source at all times. This suggested that a market existed for a laptop-style computer that would take advantage of the user's reduced need for portability, allowing for higher-performance components, greater expandability, and higher-quality displays. Desktop replacement computers are also often used with a port replicator, to fully enjoy the desktop comfort.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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