So this summer I plan on taking a long break from my arduino and learning some more 'ancient' and fun stuff. I plan on learning to use and make different circuits using TTL's. I have read a bit on it and learned on the basic logic gates like(using '/' as separator for the reverse) n/and,n/or. There is one kind of logic gate I'm curious about(this is something I've made on minecraft and if it works irl with logic gates). Question: Is there a logic gate or IC that (uses 2 inputs and 2 outputs) when line A is high, line B will never be(and reverse). No matter what you put into line (off), if will produce no output. This would be a really useful piece for my first project I am planning for the summer. I plan on making a battery powered Tic Tac Toe game. I haven't started yet and am going to start drawing up a sheet(don't remember what they are called, it's a drawing on how the entire thing is connected and where) for what I am going to build.