Portable memory device

Details Portable memory device Portable memory device

1981-12-04

1984-05-15

Popek, Joseph A.

Static information storage and retrieval

Powering

Data preservation

34087029, 455606, G11C 700

Patent

active

044492065

ABSTRACT:
A small portable memory device has optical connectors except for those connecting with an external power source. The memory device incorporates a semiconductor memory and information such as address and data information are applied externally by means of light beams. The light signals applied to the device are converted into electrical signals by phototransistors and the address and data information applied externally, one bit at a time, are temporarily stored in a shift register incorporated in the device. When the received input attains a predetermined number of bits, the semiconductor memory is accessed to effect the writing or reading of data. When reading the data, electrical signals indicative of the data to be read are converted into light signals by a light-emitting diode and are delivered from the device in the form of light signal.

REFERENCES:
patent: 3980935 (1976-09-01), Worst
patent: 4044339 (1977-08-01), Berg
patent: 4213119 (1980-07-01), Ward et al.
patent: 4298839 (1981-11-01), Johnston

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