ALU Help

Posted by snowkel on Sep 14, 2016; 12:25am
URL: http://nand2tetris-questions-and-answers-forum.52.s1.nabble.com/ALU-Help-tp4030242.html

I'm having difficulties trying to understand the ALU and writing the hdl for it. I've tried filling out this chart  but I know I'm doing something wrong due to my lack of understanding.

http://nand2tetris-questions-and-answers-forum.32033.n3.nabble.com/file/n95834/alu_worksheet.pdf

Here is my attempt at trying to fill in the first box.
http://imgur.com/a/c5oRr

Can someone point me in the right direction?