//This code was written to be easy to understand. //Code efficiency was not considered. //Modify this code as you see fit. //This code will output data to the Arduino serial monitor. //Type commands ...

The Arduino Uno-compatible board has an MCS-51 (often called 8051 instead) instead of the usual ATmega328P/ATmega168. Specifically, [ElectroBoy] uses the AT89S52.