I am curious to know if there would be any interest for using the Arduino to emulate the various logic circuits. I've done this already and posted my code back in 2015 on the Parallax Forums in Parallax's Propeller IC, I will make the effort if there is any interest. I don't think I've seen anyone do this on Arduino yet. It makes for a nice way to understand logic IC's when you don't actually have them on hand.
A link to my old project on the other Forum, full source code, the Logic Tables in the code comments were mangled by their forum software.
Good work 
Which Arduino do you intend to use? The smaller Arduinos (Uno...) have a limited number of pins, even if the anlog pins also can be used for digital I/O.
The Flip-Flop will not be a problem after conversion to Arduino code. We could demonstrate several FF types (RS, JK, D).
DrDiettrich:
Which Arduino do you intend to use?
I would start with the Uno and expand it to the Mega if needed. I was debating in my old project to use IO expanders but figured it would add unintended complexity to the simplicity of the logic.
Right, the use of expanders obfuscates the code to some degree 