Epson Hx 20

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. 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.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 (smaller than that on many mobile phones today) which allowed 4 lines of 20 characters, a calculator-size dot-matrix printer, the EPSON BASIC programming language, 16 kB RAM expandable to 32 kB and a built-in microcassette drive. It uses a proprietary operating system, which consists of the Epson Basic interpreter and a system monitor program, and weighs approximately 1.6 kg. Known colours of the machine are silver and cream, while some prototypes were dark grey.