Abstract: An optically linked calculator system for displaying data generated by a local calculator at both the local calculator and at a detached display. The calculator system includes a plurality of transmitting calculators and receiving units. The receiving units include remote display receiving units and receiving calculators. Transmitting calculators transmit entered data and calculated results. Receiving units receive and display transmitted data entries and calculated results. A calculator includes a keyboard, keyboard logic, processing logic, display, display logic, transmit logic, infrared transmitter, switching means, infrared receiver receiver logic and converting logic. The switching means selectively enables components of the calculator for effecting a transmit mode, receive mode, and calculate mode. The remote receiver display unit includes an infrared receiver, data detection logic, processing logic, and a display.