Atari ST <computer> A {personal computer} released by {Atari} in 1985. The "ST" stands for "Sixteen/Thirty-two", from the {Motorola 68000}'s 16-bit {external bus} and 32-bit processor. The original 520ST model had an external {floppy drive} and power supply whereas the 1040ST had them built-in. The 520 and later 520STFM came with 512 KB of {RAM}, the 1040 had 1 MB. Several upgraded models followed, up to the 1993 {Motorola 68030} based {Falcon}. The ST was the first home computer with built-in {MIDI ports} and plenty of MIDI software. A wide range of other software from office to games was also available. (2006-10-30)