Although Atari's ST range was selling well, its styling leaned more toward the home rather than the business market. In order to make the machine more appealing to business users, the Mega ST range was introduced. Basically the same as the other models, the main difference was the use of a separate system unit and keyboard.
The machine was available in either 1MB or 4MB models.
When introduced, the ST was often referred to as Atari's "Macintosh killer", a 16-bit computer with a graphical operating environment (Digital Research's GEM) clearly aimed to compete with the rather more expensive Apple Mac. The machine typically came as a bundle containing the computer itself, a 360k 3½" floppy drive, mouse and 12" monochrome monitor for £749. A 720k floppy drive and colour monitor were also available.