Editing Atari ST (section)

== Models ==
The members of the ST family are listed below, in roughly chronological order:

; 520ST: original model with 512&nbsp;KB RAM, external power supply, no floppy disk drive. The early models had only a bootstrap ROM and TOS had to be loaded from disk.
; 520ST+: same as the original model 520ST, but with 1&nbsp;MB of RAM,
; 260ST: originally intended to be a 256&nbsp;KB variant, but actually sold in small quantities in Europe with 512&nbsp;KB. Used after the release of the 520ST+ to differentiate the cheaper 512&nbsp;KB models from the 1&nbsp; MB models. Because the early 520STs were sold with TOS on disk, which used up 192&nbsp;KB of RAM, the machine only had around 256&nbsp;KB left.
; 520ST<sup>M</sup>: a 520ST with a built-in modulator for TV output and 512&nbsp;KB RAM.
; 520ST<sup>FM</sup>: a 520STM with a redesigned motherboard in a larger case with a built-in floppy disk drive (in some cases a single-sided drive only), and 512&nbsp;KB RAM.
; 520ST<sup>F</sup>: a 520STFM without RF modulator
; 1040ST<sup>F</sup>: a 520STFM with 1&nbsp;MB of RAM and a built-in double-sided floppy disk drive, but without RF modulator
; 1040ST<sup>FM</sup>: a 520STFM with 1&nbsp;MB of RAM and a built-in double-sided floppy disk drive with RF modulator
; Mega ST (MEGA 1, MEGA 2, MEGA 4): redesigned motherboard with 1, 2 or 4&nbsp;MB of RAM, respectively, in a much improved "[[Pizza-box form factor|pizza box]]" case with a detached keyboard. All MEGA mainboards have a PLCC socket for the BLiTTER chip and some early models did not include the BLiTTER chip. They also included a real-time clock and internal expansion connector. Some early MEGA 2 had a MEGA 4 mainboard with half of the memory chip places unpopulated and the MEGA 2 can be upgraded by adding the additional DRAM chips and some resistors for the control lines. The MEGA 1 mainboards had a redesigned memory chip area and could not be upgraded in this way as there are only places for the 1&nbsp;MB DRAM chips.
; 520ST<sup>E</sup> and 1040ST<sup>E</sup>: a 520STFM/1040STFM with enhanced sound, a BLiTTER chip, and a 4096-color palette, in the older 1040-style all-in-one case
; [[Atari MEGA STE|Mega STE]]: same hardware as 1040STE except for a faster 16&nbsp;MHz processor with 16K cache, an onboard SCSI controller, additional faster RS232 port, VME expansion port, in an ST gray version of the TT case
; [[STacy]]: a [[portable computer|portable]] (but definitely not [[laptop]]) version of the ST with the complete ST keyboard, an LCD screen simulating 640x400 hi-res, and a mini-trackball intended mostly for travelers and musicians because of the backlit screen and its built-in midi ports. Originally designed to operate on 12 standard [[C battery|C cell]] flashlight batteries for portability, when Atari finally realized how quickly the machine would use up a set of batteries (especially when rechargeable batteries of the time supplied insufficient power compared to the intended alkalines), they simply glued the lid of the battery compartment shut.
; [[ST BOOK]]: a later portable ST, more portable than the STacy, but sacrificing several features in order to achieve this, notably the backlight and internal floppy disk drive. Files were meant to be stored on a small amount (one megabyte) of internal [[flash memory]] 'on the road' and transferred using serial or parallel links, memory flashcards or external (and externally powered) floppy disk to a desktop ST once back indoors. The screen is highly reflective for the time, but still hard to use indoors or in low light, it is fixed to the 640 × 400 1-bit mono mode, and no external video port was provided. Despite its limitations, it gained some popularity, particularly amongst musicians.

=== Unreleased ===
The 130ST was intended to be a 128&nbsp;KB variant. It was announced at the 1985 CES alongside the 520ST but never produced. The 4160ST<sup>E</sup> was a 1040ST<sup>E</sup>, but with 4&nbsp;MB of RAM. A small quantity of development units were produced, but the system was never officially released. Atari did produce a quantity of 4160STE metallic case badges which found their way to dealers, so it's not uncommon to find one attached to systems which were originally 520/1040STE. No such labels were produced for the base of the systems.

=== Related systems ===
[[Atari Transputer Workstation]] is a standalone machine developed in conjunction with Perihelion Hardware, containing modified ST hardware and up to 17 [[transputer]]s capable of [[massively parallel]] operations for tasks such as ray tracing.

=== Clones ===
Following Atari's departure from the computer market, both Medusa Computer Systems and Milan Computer manufactured Atari Falcon/TT-compatible machines with [[Motorola 68040|68040]] and [[Motorola 68060|68060]] processors. The [[Atari Coldfire Project|FireBee]] is an Atari ST/TT clone based on the [[Freescale ColdFire|Coldfire]] processor. The GE-Soft Eagle is a 32&nbsp;MHz TT clone.<ref>{{cite web| url = https://www.soundonsound.com/sos/1995_articles/jun95/atarinotes.html| title = Article in SOS, June 1995}}</ref>