Interface circuitry for interconnecting touch tablet with a comp

Details Interface circuitry for interconnecting touch tablet with a comp Interface circuitry for interconnecting touch tablet with a comp

1984-03-30

1986-04-08

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340709, G08C 2100

Patent

active

045814830

ABSTRACT:
Interface circuitry is provided for interconnecting a source of positional data such as a touch tablet with a computer interface. The circuitry acquires voltages from the source of positional data which represent the data. An acquired voltage is compared with a ramped voltage. At the time of crossover the internal capacitor of the computer interface is rapidly charged above the threshold level to provide positional data from the external source to the computer interface.

REFERENCES:
patent: 3798370 (1974-03-01), Hurst
patent: 3906197 (1975-09-01), Grover
patent: 3911215 (1975-10-01), Hurst et al.
patent: 4079194 (1978-03-01), Kley
patent: 4214122 (1980-07-01), Kley
patent: 4291303 (1981-09-01), Cutler et al.
patent: 4313113 (1982-01-01), Thornburg
patent: 4319078 (1982-03-01), Yokoo et al.

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