ATMega328 and 7400 chips

adwsystems:
There are no other connections other than what I listed. That's all of the folks. NAND chip turn into an OR gate as found on the web and the 2 pin 9 inputs and the pin 19 output.

Universal Logic Gate NAND - Logic Gate - dyclassroom | Have fun learning :-) (all the way to the bottom)

OK. One schematic attached.

And your link doesn’t work.

You should realize by now what a questioners responsibility is when they ask a question.
But then again I guess not.

One more name to add to the list.