This uses the full adder shown in my Computer Circuits world, plus more support circuitry to make it a full addition and subtraction module, in 16 bits.
Here's the link:
I cannot post to the CC myself, so I can only post it here and the wiki. Here's a couple images.
The inside (before I added subtraction) :
The circuit (ditto):
Last Edited By: Stanimus 3 May, 2017 04:22:14. Edited 3 times