Matsushita Electric Industrial Co., Ltd.

Sony Corporation

Fujitsu Corporation

Sanyo Electric Co., Ltd.

Pfu Limited

Ascii Corporation

Panafacom Limited

Shuichi Sakaguchi

Takashi Suzuki

Hitoshi Ebihara

Akira Kamakura

Takashi Hazui

Kazuko Sasaki

Sadayoshi Sato

Hiroshi Iinuma

A method differentiates simultaneous and sequential key strokes by detecting simultaneous key strokes if two keys are pushed within a judging time T.sub.L. The method includes the steps of (a) measuring a first time T.sub.1 from a time when a first key is pushed to a time when a second key is pushed, and a second time T.sub.2 from the time when the second key is pushed to a time when one of the first and second keys is released, (b) comparing the first and second times T.sub.1 and T.sub.2 with an arbitrary threshold function T.sub.C which is set within the judging time T.sub.L, and (c) differentiating whether key strokes of the first and second keys are simultaneous or sequential based on a comparison result of the step (b).

Method and apparatus for differentiating simultaneous and sequential key

A floppy disk unit has a motor drive mechanism and a data read/write circuit, a control means which changes the speed of rotation of motor and the electrical characteristics of the read/write circuit in accordance with the characteristic of the disk used and thereby the disks to be used with different speeds of rotation can be used in the same floppy disk unit.

Floppy disk unit

Growing community of inventors

Yamato, Japan

Shuichi Sakaguchi