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NEED HELP creating a 4-bit ADDER/SUBTRACTOR in Logisim

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maximat10

Joined Dec 10, 2017
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Hello, I need help creating a 4-bit adder/subtractor on Logisim which will display the results on a 7-Segment display. My current circuit adds my inputs and displays up to "9" on a single 7-Segment display, but I also need to display negative numbers as well as displaying the letter "E" when overflow occurs. Attached is my current Logisim circuit. I appreciate any help :)
 

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