Digital electronic circuit for addition and subtraction of 5211 code - has two input registers to receive code numbers, circuit which can be used to either add or subtract, and register to store result

摘要

The circuit has input registers (1, 2) that connect with a switchable circuit (4) for the addition/subtraction functions. The output of the processor is received by a results shift register (3) with an associated stage (50) for the decimal point position control. In addition to the output register, there is a second auxiliary register (25) that is used during both addition and subtraction cycles. General control signals for the operations are generated by a separate circuit.