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Epson HX-20
The Epson HX-20 (also known as the HC-20) is generally regarded as the first laptop computer, announced in November 1981, although first sold widely in 1983. Hailed by ''BusinessWeek'' magazine as the “fourth revolution in personal computing”, it is generally considered both the first notebook and handheld computer.
== Features ==
Epson advertised the HX-20 with a photograph of the computer on two facing magazine pages with the headline "Actual size". With about the footprint of an A4 size page, the Epson HX-20 features a full-transit keyboard, rechargeable nickel-cadmium batteries, a built-in 120 × 32-pixel LCD which allowed 4 lines of 20 characters, a calculator-size dot-matrix printer, the EPSON BASIC programming language, two CPUs at 〔(HX-20 Operations Manual )〕 which is essentially a souped up Motorola 6801,〔(jrok.om - Replacement CUS60, CUS63 and some CUS64 )〕 RAM expandable to , two RS-232 ports at a maximum of for the first 8-pin DIN connector intended for modem or serial printer with the second port capable of using a 5-pin DIN connector which was mainly for use with external floppy drive and video display〔 an early concept of docking station, a acoustic coupler was available,〔 built-in microcassette drive, barcode reader connector.〔 Uses a proprietary operating system, which consists of the EPSON BASIC interpreter and a monitor program, and weighs approximately . Known colours of the machine are silver and cream, while some prototypes were dark grey. The HX-20 was supplied with a grey or brown carry case. An external acoustic coupler, the CX-20, was available for the HX-20, as was an external floppy disk drive, the TF-20, and an external speech synthesis Augmentative Communication Device (ACD), ‘RealVoice’. Another extension was the serially connected character video. It used a special protocol, EPSP, which was also used by the external floppy disk drive.
The battery life of the HX-20 was approximately running BASIC and less using the microcassette, printer or RS-232.〔 The data integrity could be preserved in the range.〔 The power supply was rated for .〔 Operating and charging it would tolerate .〔 Data integrity could be preserved at .〔 The HX-20 could be stored between .〔
The later, more popular TRS-80 Model 100 line, designed by Kyocera, owed much to the design of the HX-20.
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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