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Created Jan 0001
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Atari ST

“The Atari ST is a family of personal computers released by Atari Corporation in the mid‑1980s. It was the first home computer to ship with a bit‑mapped colour...”

Contents
  • 1. Overview
  • 2. Etymology
  • 3. Cultural Impact

Atari ST

The Atari ST is a family of personal computers released by Atari Corporation in the mid‑1980s. It was the first home computer to ship with a bit‑mapped colour graphical user interface (GUI) and a built‑in MIDI implementation, positioning it as a serious contender for both professional and hobbyist markets. The line originated from the rivalry between Atari, Inc. and Commodore International and was developed under the leadership of Jack Tramiel after his acquisition of Atari’s consumer division in 1984.

== Development ==
The project began as a response to Atari’s failed attempt to acquire the rights to the Lorraine chipset originally created by Hi‑Toro (later Amiga). After Commodore purchased Amiga and redirected the chipset for its own use, Atari sued to protect its investment, leaving the design in limbo. Warner Communications, Atari’s parent at the time, eventually authorized a rapid five‑month engineering effort led by ex‑Commodore engineer Shiraz Shivji. The resulting hardware used the Motorola 68000 CPU and a custom set of ASICs, including the Shifter video shift‑register chip and the YM2149F programmable sound generator. The first prototype was demonstrated at the January 1985 Consumer Electronics Show in Las Vegas, and the machine entered limited production in April 1985 with a wide retail launch in July 1985.

== Hardware ==
The Atari ST’s hardware design is defined by a mix of custom and off‑the‑shelf components:

  • CPU – Motorola 68000 @ 8 MHz (later models ran at 16 MHz).
  • Memory – 512 KB to 4 MB of RAM, expandable via SIMM slots.
  • Graphics – Capable of three display modes: 320 × 200 with 16 colours from a 512‑colour palette, 640 × 200 with 4 colours, and a monochrome 640 × 400 mode. The Shifter chip enables bitmap graphics using 32 KB of contiguous video memory.
  • Sound – Yamaha YM2149F PSG providing three square‑wave voices and one noise channel; later STE models added a PCM‑capable audio controller.
  • Storage – Initially single‑sided 3.5‑inch floppy drives (360 KB), later upgraded to double‑sided 720 KB drives. The SCSI‑like ACSI port supported external hard disks and laser printers.
  • Ports – Includes RS‑232 serial, Centronics parallel, two Atari joystick ports, a pair of MIDI IN/OUT ports, a monitor connector (RGB or composite), and an ACSI DMA port.
  • Operating System – Shipped with TOS (The Operating System) v1.00, which incorporates GEM (Graphics Environment Manager) as its GUI. Early units booted TOS from floppy before a ROM version was finalized.

The original 520ST model contained 512 KB of RAM and required a boot floppy to load TOS; the 1040ST added 1 MB of RAM and an integrated double‑sided floppy drive. Subsequent variants expanded the line with enhanced graphics, sound, and processing capabilities.

== Operating system ==
The Atari ST’s operating environment consists of three tightly coupled components:

  • TOS – A monolithic firmware that manages boot, input/output, and basic file operations.
  • GEM – A graphical user interface licensed from Digital Research, offering windows, icons, and a mouse‑driven desktop.
  • GEMDOS – A disk file system derived from CP/M‑68K, providing hierarchical directories and support for sub‑directories.

GEM’s Virtual Device Interface (VDI) allowed applications to communicate with peripherals by addressing drivers directly, a design that later influenced MIDI‑centric music software. The system’s character set is based on code page 437, the same set used by early IBM PCs.

== Release ==
Atari announced the Atari 520ST at the 1985 Winter Consumer Electronics Show in Las Vegas, with a limited press release in January and a broader rollout in July. The machine was marketed with the slogan “America, We Built It For You” and positioned as a low‑cost alternative to the Apple Macintosh and Commodore Amiga. Early sales were strongest in Europe, where pricing was less inflated by foreign‑exchange rates. By November 1985 Atari reported over 50 000 units sold in the United States alone.

The 1040ST followed in 1986, offering twice the RAM and an integrated floppy drive, and was quickly embraced by professionals needing desktop publishing and CAD applications. Atari later introduced the Mega series (Mega 1, Mega 2, Mega 4) with up to 4 MB of RAM and a more sophisticated pizza‑box chassis. In 1989 the STE (ST Enhanced) model added a blitter coprocessor, a 4 096‑colour palette, and improved audio capabilities. The final generation comprised the TT030 workstation and the Falcon030, both equipped with the 68030 CPU and higher‑resolution video modes. The entire ST line was discontinued in 1993 as Atari shifted focus to its Jaguar console.

== Design ==
The original 520ST’s industrial design, crafted by Ira Velinsky, features a wedge‑shaped case with angular lines and rear ventilation grilles. The keyboard is a full‑size, tactile unit with a dedicated function‑key row and numeric keypad. Early units used an external power supply and an external floppy drive (model SF354); later revisions integrated the drive and power source into the base unit, reducing cable clutter.

Key hardware interfaces include:

  • RS‑232 serial port (DB‑25 male) for modem and terminal connections.
  • Centronics parallel port (DB‑25 female) that also serves as a makeshift joystick input via adaptors.
  • Atari joystick ports (DE‑9 male) supporting up to four controllers through a splitter.
  • MIDI ports (5‑pin DIN) for direct connection to musical instruments.
  • ACSI DMA port (custom 19‑pin D‑sub) for hard‑disk and printer communication.
  • Monitor output via a 13‑pin DIN connector that can drive both RGB and composite video signals.

These ports made the ST particularly attractive to musicians, who could connect MIDI devices directly without additional adapters.

== Variants ==
The Atari ST family evolved through several distinct models, each building on the previous generation:

  • 520ST – Original model with 512 KB RAM, external floppy, and no built‑in monitor.
  • 520ST+ – Same chassis with 1 MB RAM.
  • 260ST – Intended as a low‑cost 256 KB version, sold only briefly in Europe.
  • 520ST M / FM – Added RF modulator for TV output; FM version included an internal double‑sided floppy.
  • 1040ST F / FM – 1 MB RAM with integrated floppy; FM adds TV output.
  • Mega 1 / 2 / 4 – Redesigned “pizza‑box” case, detachable keyboard, and up to 4 MB RAM; introduced a real‑time clock and expansion slot.
  • STE – Enhanced model with blitter, 4 096‑colour palette, PCM audio, and upgraded TOS 1.06.
  • STacy – Portable version with LCD screen and built‑in MIDI, marketed to traveling musicians.
  • ST Book – Ultra‑portable variant with flash memory storage and a reflective monochrome display.
  • TT030 – High‑end workstation with a 32 MHz 68030 CPU and integrated hard‑disk enclosure.
  • Falcon030 – Final ST‑era machine featuring a 16 MHz 68030, on‑board DSP, and advanced graphics modes.

Unreleased prototypes such as the 130ST (128 KB variant) and 4160STE (4 MB RAM) never reached mass production, though development units and prototype badges survive in collector circles.

== Software ==
The Atari ST ecosystem featured a diverse array of applications, ranging from productivity tools to creative suites:

  • Desktop publishing – Programs such as Timeworks Publisher, PageStream, and Calamus leveraged GEM’s GUI for layout and typesetting.
  • Word processing – WordPerfect, Microsoft Write, and AtariWorks provided full‑featured editing.
  • Spreadsheets – 3D‑Calc offered three‑dimensional calculations.
  • Databases – Zoomracks and ChessBase (the latter co‑developed with Garry Kasparov) catered to professional data management.
  • Graphics – NEOchrome, DEGAS Elite, and Deluxe Paint enabled high‑resolution artwork; the STOS BASIC dialect facilitated game development.
  • Audio and MIDI – Cubase, Logic Pro (originally Creator/Notator), and KCS sequencer software turned the ST into a staple of home studios. Tracker applications like TCB Tracker popularized chiptune music creation.

The platform also supported a variety of programming languages, including Atari BASIC, GFA BASIC, Omikron BASIC, and several C compilers (Alcyon C, Mark Williams C, GNU C). Development kits were initially expensive but later became affordable, encouraging a vibrant hobbyist scene.

== Games ==
Although initially marketed toward professionals, the ST quickly gained a reputation as a capable gaming machine thanks to its fast CPU, colour graphics, and built‑in MIDI for multiplayer coordination. Notable titles include:

  • Dungeon Master – Often cited as the best‑selling ST software, it pioneered real‑time 3D dungeon crawling.
  • MIDI Maze – A first‑person shooter that used the ST’s MIDI ports for networked multiplayer deathmatch across up to 16 machines.
  • Starglider, Goldrunner, Gauntlet, and Super Sprint showcased the system’s graphics and sound capabilities.
  • Jazz Jackrabbit (later ported to other platforms) and Oids demonstrated physics‑based gameplay.

The ST’s gaming library also featured numerous ports of arcade classics and original indie releases. Developers such as Peter Molyneux, Jeff Minter, and Éric Chahi produced critically acclaimed titles that remain celebrated in retro‑gaming circles. The STE enhancements were utilized sparingly, primarily in games like Obsession and Sleepwalker, but the larger user base of classic ST models meant most releases targeted the original hardware.

== Peripherals ==
Atari ST’s expandability was a key factor in its longevity:

  • Monitors – The SM124 and SM125 monochrome units, and the SC1224/SC1425 colour models, offered crisp 640 × 400 or 640 × 200 displays. The SM195 provided a 19‑inch high‑resolution option for the TT030.
  • Printers – Atari’s SLM605 and SLM804 laser printers utilized the ACSI DMA port for high‑quality output.
  • Storage – External hard drives such as the SH204, SH205, and Megafile series connected via ACSI; later, SatanDisk and UltraSatan adapters enabled SD/MMC card storage.
  • Input devices – The ST supported standard Atari joysticks, mice, and analog paddles; the CX40 joystick and XG‑1 light gun were popular for arcade‑style games.

These peripherals, combined with the system’s MIDI ports, made the ST a versatile platform for both creative and entertainment purposes.

== Legacy ==
The Atari ST’s impact persists in several domains:

  • Music production – Artists such as Tangerine Dream, Mike Oldfield, Fatboy Slim, and Darude relied on the ST’s MIDI implementation and Cubase sequencer during the 1980s and 1990s.
  • Demo scene – The ST remains a favorite among retro‑computing enthusiasts, who maintain an active demo and homebrew community. Events like the ST Offline Tournament (STOT) keep competitive interest alive.
  • Emulation – Modern emulators such as Spectre GCR and Hatari allow the ST’s software library to be preserved and played on contemporary hardware.
  • Collectibility – Original hardware, especially the STacy, ST Book, and limited‑edition Mega STE, are sought after by collectors and frequently appear on marketplaces.

Although eclipsed by the PC and later consoles, the Atari ST’s blend of affordability, MIDI connectivity, and graphical capability cemented its place in the history of personal computing.

== See also ==

  • [[Atari 8‑bit computers]]
  • [[Atari Jaguar]]
  • [[Amiga]]
  • [[Apple Macintosh]]
  • [[Commodore 64]]
  • [[Digital Research]]
  • [[Graphics Environment Manager]]
  • [[GEM (desktop environment)]]
  • [[Motorola 68000]]
  • [[MIDI]]
  • [[Desktop publishing]]
  • [[Music sequencer]]
  • [[Retrocomputing]]

== References ==
{{reflist}}

== External links ==

  • {{Commonscat|Atari ST}}
  • [[AtariMania]] – Atari ST software preservation project
  • [[Atari‑Forum]] – Community hub and STOT tournament information
  • [[Atari Legend]] – Central portal for Atari ST history
  • [[AtariCrypt]] – Diverse hub for Atari ST enthusiasts

{{Atari}}
{{Personal computers}}
{{1980s computers}}

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[[Category:1985 introductions]]
[[Category:Discontinued computer types]]
[[Category:16-bit computers]]
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[[Wikipedia:Verifiability|verification needed]]
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(This article incorporates material from the Wikipedia page on Atari ST, released under the Creative Commons Attribution-ShareAlike License.)