Typewriter-calculator combination for the physically disabled

摘要

To enable a severely disabled person to use an electric typewriter for arithmetic calculations an electronic calculator is coupled to the printing mechanism of the typewriter through a selector whereby the transmission of the output of the calculator to the printing mechanism can be permitted or prevented. To simulate the key-signals normally used for the calculator, a simulator circuit is coupled to the control apparatus provided for enabling a disabled person to use the typewriter and simulates key-signals in response to commands from such control apparatus. One or more infrequently used signals from the control apparatus are employed as special signals to operate the selector to permit print-out of the calculator output when required.