There are several discrete transistor computers posted on the net, some with complete schematics. http://hackaday.com/2012/04/20/building-a-computer-with-discrete-transistor… There was a German (possibly Dutch?) guy that made a discrete transistor computer using all one kind of SMT transistor and other SMT components on PC boards, it was the size of a shoebox. I can't find the link now. Jon