Many people know a little bit about the internals of a 8-bit computer. The most important part is the CPU (Central Processing Unit). You can buy many different CPU's to build a computer. But Kyle from 8 Bit Spaghetti decided to make a computer the hard way. He did not buy a CPU, he build one himself from TTL chips. In this very comprehensive blog he explains how a CPU works and how you can build one yourself.