Preface: I decided to ditch my plan for Part 3 as monolith part that covers all aspects of our ALU. It'd be too long, and I found myself cutting some interesting, yet non-essential parts out. That seems stupid to me, because with approach like that you may as well just search for ALU schematic online and be done with it.
Instead I will break topics up into more parts, and talk a bit more in depth about some parts of ALU.
Last time we left off with a Full Adder on our hands, as well as, with dreams of 8-bit glory. So it would be fitting to scale up our adder into this new and exciting territory.
First let's check out our Full Adder again:
As you can see, I added text near the pins for ease of distinguishing.
Now, as some of you might've guessed from my tip in the last part, in order to go 8-bit with our little adder all we really need to do is stack'em one on top of the other. To be more precise, You take two 8-bit ...