I'm reading about a microprocessors at the moment and wondering if I could get started with an 8-bit microprocessor. What would I need to get started. I understand that they need external RAM and ROM. I don't know whether it is still possible to get an Intel 8-bit one as my book is from 1980. So are there any other recommendations?. I am looking for the circuit diagrams for creating my own PCBs, is this advisable? Something like a single board computer is what I'm looking for.