An input device for a data processor is provided with an input circuit having input keys to designate two or more kinds of functions, an operation unit to perform operational processing in accordance with function inputs from the input circuit, an auxiliary memory to store therein a state of the operation...http://www.google.fr/patents/US4523298?utm_source=gb-gplus-shareBrevet US4523298 - Input device with a keyboard in which actuation of a key more than once may cause a different function to be performed
Input device with a keyboard in which actuation of a key more than once may ...
