Abstract: In an improved multikey keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of at least one row conductor and column conductor respectively connected to portions of separate sets of row and column cascaded electrical elements whose cumulative values correspond to the specific row and column of the pressed key, the specific improvement comprising: providing the keyboard with an input signal source circuit and an output sensor circuit operatively connected to each key such that the computer upon receipt of a signal on the sensor circuit representing the pressing of a key, can make the necessary measurements to establish the identity of the pressed key.

Abstract: A multikey keyboard for inputting data into a computer, whose keys place in circuit the points of intersection of an X rank conductor and Y rank conductor matrix, characterized in that X rank and Y rank conductors are respectively connected together by interconnection resistors (R) and to an X output and Y output of the keyboard, intended to be connected to two analog inputs of the computer, so that the resistance values applied at the input of these two latter are representatively X rank and of the Y rank of any key pressed.

Abstract: An improved multikey matrix keyboard for inputting data into a computer, wherein pressing a key places in circuit the point of intersection of a plurality of row conductors and a plurality of column conductors respectively connected to portions of separate sets of row and column sequential series of measurable electrical elements whose cumulative values correspond to the specific row and column of the pressed key. By employing a plurality of row and column key output circuits, the number of keys present in the matrix keyboard is exponentially increased.