Check out "Introductory Microcontroller Programming" by Peter Alley (to be clear, not me.) for Wocester Polytech; I came across this by accident the other day -

Check out "Introductory Microcontroller Programming" by Peter Alley (to be clear, not me.) for Wocester Polytech; I came across this by accident the other day - [pdf] https://web.wpi.edu/Pubs/ETD/Available/etd-042811-095908/unrestricted/alley.pdf https://web.wpi.edu/Pubs/ETD/Available/etd-042811-095908/unr... Over the period of being the TA for these courses multiple times, I learned a great deal, but also noticed several recurring issues the students seemed to face. In addition to furthering my own knowledge on the care and feeding of microcontrollers, this thesis is an attempt to provide students with a resource to overcome some of their difficulties, to provide a better understanding of the hardware level operation of a microcontroller, and as instruction into improving their knowledge and code. edit: in addition, for really low level hardware, check out Ben Eater's series on YouTube building a breadboard 6502