Rulebook and notepad: Turing Machines Explained. Turing 6502 Part 1.
Schematics are available at www.github.com/Turing6502/Turing6502
Turing6502 Part 1 - The Rulebook.pdf
This video provides an introduction to Alan Turing and describes the machine he defines, the Turing Machine.
A Turing machine has two major components and this video discusses the Rule Book. Following this, there is a breadboard build of the Rule Book required to emulate the 6502 microprocessor