[Damian Peckett] has implemented an Apple ][, its 6502 processor, and a cassette port, all on an Arduino Uno. If that wasn’t enough, he also uses a PS/2 keyboard for input and outputs analog VGA.

The build relies on that old stalwart, the Arduino Uno, to run the show. It’s hooked up to a DS3231 real-time clock module so it can keep accurate time for long periods, as is befitting a clock.

What if you could get an instant SMS alert the moment a fire or smoke is detected at home or office? Through this project ...

Apart from understanding the Arduino's code language ... It's similar to the iconic Uno in a lot of ways. For instance, it's based on the same microcontroller, uses almost identical pinout ...