Two important objectives of keyboard input method are to gain speed and to lessen the fatigue of operators. An input method, which uses newly designed TRON keyboard layout, for BTRON to achive these two objectives is proposed. BTRON is an operating system for high-performance workstations. The TRON keyboard layout is based on the data of the physical size of hands of Japanese. Firstly, physical placement of keytops, which are easy to strike and causes less fatigue was determined using the data. Secondly, character frequencies in real documents was used to decide the final location of each character in the keyboard.
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