Mmmm Z80! top CPU!
I toyed with the idea of a homebrew computer based on one of those. ever since my GCSE Electronics project in 1988!
(I had to do something less ambitious - an Audio ADA for my speccy - didnt work!)
I am now going to resurrect the idea (as far as possible with 3 kids, a wife :roll:, two amigas to play with, and sorting the wimmins' problems with the house PC!)
I kinda got stuck on getting the RAM interface between CPU and Video sorted out (trying to prevent these from clashing), but I have ideas there...