Bidirectional data transfer and storage system

Abstract From the Canadian patent

A system for bidirectionally receiving and transmitting alpha-numeric digital data via matching light emitting diodes and photocells. More particularly a portable random, access memory unit incorporated in a device such as a wristwatch which is adapted to be programmed by moans of a relatively stationary programming device e.g. a telephone handset when, placed in close proximity thereto establishes at least one communication channel whereby digital data which may be for ex-, ample, a plurality of telephone numbers and other selected data are loaded into the portable memory device. Thereafter the, portable memory device is placed in close proximity with a relatively static receiver device …