Digital electronic circuit for multiple-addition and -subtraction - has arithmetic unit with control circuit and register based unit for control of decimal point, and supplies additional pulse when key is pressed

摘要

A digital electronic circuit is provided for the addition and subtraction of binary code numbers that are generated from decimal inputs. The arithmetic processing circuit is based upon adder logic together with a control circuit that has pulse generation and provides for multiple addition and subtraction operations. Shift register stage provide a storage facility for the values. A series of front panel keys allow various selections to be made. Control of the decimal point of the numbers is provided by a circuit stage having decimal point shift registers (50a,50c) coupled to a pair of logic gating stages (81,82). ADVANTAGE - Improved decimal point control.