Short answers, pulled from the story.
The Atari ST had a limited release in April 1985 and was widely available by July 1985. The initial model, the Atari 520ST, was the first version of the computer to reach consumers during this period.
The name Atari ST officially stands for Sixteen/Thirty-two, a reference to the Motorola 68000 processor's architecture. This design featured a 16-bit external bus and 32-bit internal registers.
Prominent artists such as Tangerine Dream, Depeche Mode, and the Utah Saints used the Atari ST to create some of the most iconic music of the late 1980s and 1990s. The machine's built-in MIDI ports made it a favorite among amateur and professional musicians.
The Atari ST line was discontinued in 1993, as Atari shifted its focus to the Jaguar video game console. The final models of the ST line, including the Falcon 030 and the Mega STE, were released in the early 1990s.
The 1040ST, released in 1986 with 1 MB of memory, was the first home computer to offer a cost per kilobyte of RAM under US$1/KB. This made it an affordable option for consumers and businesses alike.