Data sheets are available from Zilog Z-80 CPU -> Z84C00 Z-80 CTC -> Z84C30 Z-80 PIO -> Z84C20 The book "Build Your Own Z80 Computer" by Steve Ciarcia has a lot of good info. ISBN #0070109621.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.