发明名称 |
Shift control system for keyboards |
摘要 |
A shift control system for keyboard having plural character keys and at least one shift key arranged in a predetermined key matrix and the positions of which are defined by respective matrix codes, including a keyboard controller under the control of a central processing unit for determining a depression of any of the keys of the key matrix. The matrix codes of the shift keys are predetermined and so identified. The key matrix is scanned and the matrix codes of any depressed keys are determined and compared with the predetermined matrix code of the shift keys. Keycodes are formed for each depressed key based on the matrix codes produced for the respective key and based on whether or not a shift key depression is determined.
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申请公布号 |
US4470038(A) |
申请公布日期 |
1984.09.04 |
申请号 |
US19820361247 |
申请日期 |
1982.03.24 |
申请人 |
TOKYO SHIBAURA DENKI KABUSHIKI KAISHA |
发明人 |
AMANO, KATSUMI;KINOSHITA, KIYOSHI |
分类号 |
G06F3/023;H03M11/14;H03M11/18;H03M11/20;(IPC1-7):G08C9/00 |
主分类号 |
G06F3/023 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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