Coronax is a professional software developer who has electronics and retro computers as a hobby. One of his projects is Project:65. This project will be the building of a complete computer with the 6502 processor as a starting point. You can follow his work on his blog. The articles you can read are: The 6502 and 6522, Running in circles, Arduino port expansion, EEPROM Programmer, Running a program, Trivial communications, RAM and IO.