Method and apparatus for detecting added keyboard functions

Details Method and apparatus for detecting added keyboard functions Method and apparatus for detecting added keyboard functions

1994-10-24

1996-07-30

Hofsass, Jeffery

Telephonic communications

Supervisory or control line signaling

Substation originated

379359, 379361, 341 26, 341 21, H04M 126

Patent

active

055419895

ABSTRACT:
A method and apparatus for detecting the added functions of a telephone dialer by adding diodes to the IC circuit and using as part of the input pins such that the need for total number of input pins and thus the manufacturing costs of the IC are reduced. The method is executed by using the available keyboard input/output boards without increasing the need for extra input pins in order to detect whether there is any diode in existence that is connected among the input/output ports.

REFERENCES:
patent: 4825464 (1989-04-01), Wen
patent: 5101429 (1992-03-01), Geboers
patent: 5117455 (1992-05-01), Danish

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