The computer is built on an Arduino shield, using TinyBASIC, the TVout library, and the PS/2 keyboard library.

The BASIC interpreter eats up around 600 bytes in the Arduino RAM, leaving about 1.4 kB for BASIC code. Not much, but more than the lowest-end BASIC Stamp.

Official Arduino Example Tutorials: The Arduino computer software is loaded with tons of examples for you to use in your own code or to run through as a learning experience.

Chapter 1, page 11 This code is basic but allows the reader to gain insight into key elements for several other projects in this book. It combines two pieces of code that are listed in the examples ...

Thankfully, Arduino forum member Romano d'Ezzelino has put together a series of reference cards that show the basics of a number of common connections.