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The GRiDPad was a touchscreen tablet manufactured for GRiD Systems Corporation by Samsung Electronics in 1989. It is regarded as the first tablet computer directed towards consumer use. Jeff Hawkins went on to use the GRiDPad as a predecessor for his best known-invention, the Palm Pilot. ==Specifications== The GRiDPad measured 9 x 12 x 1.4 inches and weighed 4.5 pounds. The main distinguishing aspect was its touch-screen interface with a stylus, a pen-like tool to aid with precision in a touchscreen device. The stylus was able to use hand writing recognition software. The GRiDPad also included these features:〔 *10 MHz 80C86 processor *MS-DOS operating system – the popular operating system used by IBM PC-compatible personal computers *A monochromatic Color Graphics Adapter (CGA) display resolution of 640x400 *256kB or 512kB battery-backed RAM cards *1mB or 2mB of system memory *One serial port, two ATA-FLASH slots, and an expansion bus connector Because of its use for inventory management, the United States Army specified more durable versions of the tablet made out of magnesium that were not sold to the general public. The US Army specially ordered magnesium because it is a strong yet light metal, making it ideal to be used in demanding environments.〔(【引用サイトリンク】title=GRidPad 1910 )〕 According to a patent submitted in 1992 by an engineer at GRiD Systems, the touch screen in the GRiDPad works by magnifying an internal Cartesian plane and calculating the displacement. Further patents by Jeff Hawkins describe flipping the screen orientation between landscape and portrait.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「GRiDPad」の詳細全文を読む スポンサード リンク
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