I have successfully tested 4 out of the 5 chips I need for the ALU. The multiplexor was giving me some trouble; hopefully I can figure out what was going wrong. I've tried several different chips, and I think whatever's going on is because of me, not faulty chips.
Here's a video of that testing in action, on the 4 good chips. While its not overly exciting, I want to document most of this project. So... enjoy?