This page lists GUI-related trivia.

In 1983, Microsoft was in talks with Atari (specifically, Leonard Tramiel, son of the famous Jack Tramiel) to sell the upcoming Windows as the ST’s operating system. However, Windows was then two years away, and Atari decided to go with Digital Research’s GEM.

The first Atari ST from 1985 has earned a nickname “Jackintosh” because of its GEM interface (very similar to that of Macintosh) and the name of the Atari’s then new owner Jack Tramiel (of 8-bit Commodore fame).