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Browse Prior Art Database

Repeating Code Transmitting Keyboard

IP.com Disclosure Number: IPCOM000090078D
Original Publication Date: 1969-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Case, PW: AUTHOR

Abstract

The keyboard arrangement sends a multibit code signal to a receiving unit upon initial depression of a key L or R and sends repeated signals when the key is depressed to its limit and held. Key E sends a coded signal, but not repetitively.

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Repeating Code Transmitting Keyboard

The keyboard arrangement sends a multibit code signal to a receiving unit upon initial depression of a key L or R and sends repeated signals when the key is depressed to its limit and held. Key E sends a coded signal, but not repetitively.

Each key L or R closes its associated encoding contacts 1...5 when depressed a limited extent. The encoding contacts of the keys are wired, in accordance with a desired code, between a voltage supply bus 10, in heavy lines, and output terminals 1...5. Initial depression of one of these keys provides the supply voltage +V at the appropriate terminals. Further depression of the key closes its contact LB or RB, supplying a signal to the Strobe terminal via normally closed contact R2-3 of relay R2. The strobe pulse signals the receiving unit to accept the coded signals.

If repetitive application of the signals is desired, key L or R is depressed to its limit, closing contact RJ or LJ. This contact conditions R2 to be picked up when a circuit, not shown, is closed by the receiving unit indicating acceptance of the last strobed input. The acceptance completes a circuit through Restore terminal to R2 allowing it to operate for the duration of the acceptance signal. When it operates, R2 opens R2-3 and interrupts the strobe signal. Upon termination of the acceptance signal, R2-3 closes again and sends another strobe. This operation repeats for as long as the key is held down.

Key E supplies a coded input and a strobe signal upon depression, but does not repeat. It does, however, maintain the coded outputs at terminals 1...