Tiny Lisp Computer 2

My aim in designing the first Tiny Lisp Computer was to create the smallest practical self-contained computer, with its own display and keyboard, that you could use to program in Lisp. This second version extends the original Tiny Lisp Computer with four improvements: it uses the ATmega1284 to give it more program space; it includes parenthesis matching to make it easier to enter programs; it allows you to connect it to a computer via the USB port, to enter programs from the Arduino IDE’s serial monitor; and it includes a built-in program editor, to allow you to make changes to programs without having to enter them again:”