If you'd like to get started with the ZipCPU, you might wish to know that this repository contains the CPU, its documentation, and the toolchain. The CPU implementation found here, though, is just that: a CPU. This implementation requires a bus with peripherals hanging off of it, things such as RAM, flash (ROM), serial port, etc. This is just where I keep the CPU apart from any necessary peripherals. So, if you want to try out the CPU, feel free to download and build this repository (use git-clone with a depth of 1--there's a lot of stuff in the git repo that you don't necessarily need). You'll need it for the binutils, GCC, and newlib support provided by it.