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The 1535EXP was also the first rugged portable PC to attain full TEMPEST accreditation from the NSA. [3] Another modification – the Grid GRiDCASE 1537EXP – has another screen (640×480 instead of 640×400, but with less physical size). The power input is 100–240 V AC 50/60/400 Hz, 80 W.
In 1985, Compaq introduced the Portable 286, but it was replaced by the more compact Portable II in a redesigned case within a few months. The Portable 286 featured a full-height hard disk, and the options of one half-height floppy drive, two half-height floppy drives, or a half-height floppy drive and a tape backup drive.
The first commercially successful tablet-type portable computer was the GridPad, [9] released in September 1989. Its operating system was based on MS-DOS. A GRiD Compass 1101 was the first laptop in space. Required special modification to add a fan to pull air through the case. [10] Subsequently a GRiD 1530 flew on STS-29 in March 1989.
This list of computer size categories attempts to list commonly used categories of computer by the physical size of the device and its chassis or case, in descending order of size. One generation's "supercomputer" is the next generation's "mainframe", and a "PDA" does not have the same set of functions as a "laptop", but the list still has ...
A rugged tablet may be semi-rugged or fully rugged. The semi-rugged might have a protective case, rain-resistant body. Fully rugged tablets are engineered from the inside-out to work in extreme temperatures and other harsh conditions. They are designed to resist drops, shocks and vibrations while maintaining strength to be dust- and waterproof.
The Compaq Portable, one of the first IBM PC compatible systems A military-type mobile computer housed in a reinforced case A portable computer with three LCD screens A portable computer with one 20.1-inch LCD screen, EATX motherboard The MIT Suitcase Computer, MIT Digital Systems Laboratory, 1975
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