Seen on the comp.sys.amstrad.8bit newsgroup : the Stelladaptator allows the use of standard Atari 2600-compatible
controllers, including joysticks (like the one used on Amstrad CPC), paddles, and driving controllers, with modern computers running Windows, Macintosh, or Linux operating systems. Any Atari
2600-compatible joystick, when plugged into your computer through the Stelladaptor will behave as a normal joystick. This allows the use of classic Atari controllers with any software that will work with
an 8-direction digital joystick controller (left, right, up, down, and diagonals).
