Origins
The forerunners of the desktop replacement were the portable computers of the early-to-mid 1980s, such as the Osborne I, Kaypro II, the Compaq Portable and the Commodore Executive 64 (SX-64) computers. 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.
Read more about this topic: Desktop Replacement Computer
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