The Atari ST was a home computer released by Atari Corporation in 1985. The “ST” officially stands for “Sixteen/Thirty Two”, which referrs to the Motorola 68000’s 16-bit external bus and 32-bit internals. Introduced for $800/$1000 (monochrome or color monitor), it sold into the early 1990s. Memory size ranged from 512k to 4mb. Heralded as Atari’s flagship graphics machine, it competed against the Commodore Amiga and Acorn Archimedes, grabbing a significant foothold in the European market, which lagging behind in the US. Operating systems for the ST included GEM (the graphics-based interface), TOS (The Operating System), and CPM.
The ST primarily stored its data on floppy or hard drives. Models of ST include the 1040ST (STF), 520STFM,and 520ST.