A couple of DIY cpu / computer links

Here are a couple of links to homebrew cpu and computers that I thought my readers might finder interesting. The first is a homebrew CPU that I found on Hacked Gadgets. The Nibbler is a 4-bit CPU, hence the name (a nibble is half a byte).

The second link is a 3-chip retrocomputer via Hack A Day. It uses a 6502 CPU, much like the early Apple computers. I wonder if something similar could be done for the beloved 6809, as used in the Tandy CoCo