Programmable calculator with a device for controlling the reading of program data

A programmable calculator with a device for controlling the reading of program data, comprising:

• input means having ten keys for entering numeral data, a plurality of function keys for entering function data, at least one specified key for reading out program data and a manually operable switch for designating at least a program data writing mode;
• a data memory coupled to said input means for storing at least numeral data and function data;
• an arithmetic unit coupled to said data memory for executing an operation on data and for returning the data to said data memory;
• a program data memory means for storing program data which are entered by selectively operating at least one of said ten keys and function keys when said program data writing mode is designated by the operation of said manually operable switch;
• program data reading means coupled to said program data memory means for reading the program data from said program data memory means as a function of the operation of said specified key;
• display means coupled to said program data memory means and to said data memory for displaying the selected program data in the program data memory means or the selected data in the data memory;
• detection means associated with said data memory and with said arithmetic unit for detecting that said specified key is kept operated for a period of time longer than a predetermined period of time;
• and
• control means coupled to said detection means and to said program data reading means for controlling said program data reading means when said detection means detects that said specified key has been kept operated for a said period of time longer than said predetermined period of time, to cause said program data reading means to continuously read said program data from said program data memory means.