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A Full Adder with two inputs and one carry input representing two numbers to add. Three Full Adders in a Ripple representing three digit numbers. A XOR gate representing overflow.

A simple adder that adds two 4-bit integers and returns the result on a hex display.
It also keeps track of the flags.
It can also subtract if the ADD/SUB is 1
ADD/SUB = 0 => add
ADD/SUB = 1 => sub

A multi-step design of a synchronized 4-bit add/subtractor with overflow detection utilizing a 4 bit-to-4bit bus converter design and bus splitters.