Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1986-05-13
1988-07-19
Caldwell, Sr., John W.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340365P, 34082519, 250221, 400 87, G09G 300
Patent
active
047588292
ABSTRACT:
An electronically controlled mechanical keyboard simulator includes a key selector switch and a signal generating circuit for outputting a preliminary symbol selection signal and a final symbol selection signal, and a keyboard interface circuit. The keyboard interface circuit has a row selector and a column selector, and a scanner for scanning the row and column selectors. The row selector has an enable input terminal which receives the preliminary symbol selection signal as an output disabling signal and the final symbol selection signal as an enabling signal for row identification of a selected information key and output of a row identification signal to the column selector. The column selector is operative upon receipt of the row determining signal for selecting an information column identifying output terminal and outputting the selected row information thereon to a microprocessor for data retrieval and communication of the selected information to the user by a display or audio device.
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P. J. Kennedy-"Hand-Held Data Input Device"-IBM Technical Disclosure Bulletin-vol. 26, No. 11, Apr./84-pp. 5826-5827.
Caldwell Sr. John W.
Fatahi-Yar Mahmoud
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