operating system One of the first commercially available

GUIs. Borrowing heavily from the Macintosh WIMP-style

interface it was available for both the IBM compatible

market (being packaged with Amstrad's original PC series)

and more successfully for the Atari ST range. The PC

version was produced by Digital Research (more famous for

DR-DOS, their MS-DOS clone), and was not developed very

far. The Atari version, however, continued to be developed

until the early 1990s and the later versions supported 24-bit

colour modes, full colour icons and a nice looking sculpted

3D interface.