Keyboard controlled data converter

Apparatus for converting input data expressed in units of scale-of-m into data expressed in units of scale-of-n, comprising:

• data input means supplying data expressed in a basic unit of scale-of-n and data expressed in another unit of scale-of-m;
• unit indicating means including a unit indication input key operated according to the unit of said data input;
• means coupled to said unit indication input key for generating signals corresponding to the respective unit of said input data in accordance with the number of operations of said unit indication input key when the data expressed in the basic unit of scale-of-n and data expressed in the other unit of scale-of-m are supplied to said unit indicating means;
• data generating means for generating basic data used to convert said data expressed in the other units of scale-of-m to data expressed in the basic units of scale-of-n;
• an operation unit connected to receive the data from said data input means and the basic data from said data generating means;
• memory means for storing the output of said operation unit;
• and
• control means responsive to the signals generated by said unit indicating means, said control means including means for storing said input data in said memory means when said unit indicating means produces a signal corresponding to the basic unit of said input data, means for causing said operation unit to convert the input data which is expressed in any other unit than said basic unit into data of said basic unit when said unit indicating means produces a signal indicating that the input data is expressed in said other unit, means for causing said operation unit to add said converted data to said data which has been stored in said memory means, and means for storing the result of said addition in said memory means.