V2 of my 4-bit addition module and V1 of my 4-bit subtraction module. The addition module features a pin to indicate when an integer overflow has occured, it's also a little more compact compared to V1. The subtraction module is very small and fast however it can not tell if the output is positive or negative, I plan on fixing this in future. I also added a casing to the chips to make it look more presentable.

Both use a pin system so that you can remove them and replace them with a better version of them without affecting the rest of your ALU.

I have colour coded each section and used signs to make it easy to modify.

Link to V1 of my binary addition module: www.planetminecraft.com/project/4-bit-binary-addition-module-for-an-alu/