The computer was released in September 1989, but production and sales stopped in 1991 due to lack of great success.

The STacy is similar to the Apple Macintosh Portable, a portable variant of a Macintosh with a built-in monitor and keyboard.

The STacy uses 12 C-cell batteries, however, a problem was that the STacy requires a lot of power and often could not run for more than 15 minutes. To prevent the use of rechargeable batteries (which in 1989 were much less powerful than the non-rechargeable ones), Atari decided to make these non-replaceable.

Thanks to the built-in MIDI ports, just like the Atari ST, this computer was used by musicians as a sequencer or controller.

There were 4 versions, the STacy had 1MB memory and 1x 3.5" floppy. The STacy 2 had 2MB memory. Of the latter there were 2 models, 1 with 20MB SCSI harddisk and 1 without. The 4th version was the Stacy 4 with 4MB memory and a 40MB SCSI hard disk.

The computer itself weighs almost 7 KG and around 35,000 units have been produced.