I'm trying to make an ALU again, probably the third time. Nothing worth noting.
I learn redstone back in 1.3 (beta), and I kept up until about the time pistons came out. I've never been very good at making stuff compact, but I'm perfectly good at combining gates and the sort to make more complicated stuff.
Basically, I'm requesting a compact (preferably tileable) full adder design, and I'd like to know what the minecraft standard is for subtraction. I know CX Gamer had a good full adder design, but I'm not sure if it's even close anymore considering that was before pistons.