Atari ST
Atari ST is a line of personal computers from Atari Corporation and the successor to the company's 8-bit computers. The initial model, the Atari 520ST, had limited release in April–June 1985, and was widely available in July. It was the first personal computer with a bitmapped color graphical user interface, using a version of Digital Research's GEM environment from February 1985. The Atari 1040ST, released in 1986 with 1 MB of memory, was the first home computer with a cost per kilobyte of RAM under US$1/KB.
After Jack Tramiel purchased the assets of the Atari, Inc. consumer division in 1984 to create Atari Corporation, the 520ST was designed in five months by a small team led by Shiraz Shivji. Alongside the Macintosh, Amiga, Apple IIGS, and Acorn Archimedes, the ST is part of a mid-1980s generation of computers with 16 or 16/32-bit processors, 256 KB or more of RAM, and mouse-controlled graphical user interfaces. "ST" officially stands for "Sixteen/Thirty-two", referring to the Motorola 68000's 16-bit external bus and 32-bit internals.
The ST was sold with either Atari's color monitor or less expensive monochrome monitor. Color graphics modes are available only on the former while the highest-resolution mode requires the monochrome monitor. Most models can display the color modes on a TV. In Germany and some other markets, the ST gained a foothold for CAD and desktop publishing. With built-in MIDI ports, it was popular for music sequencing and as a controller of musical instruments among amateur and professional musicians. The Atari ST's primary competitor was the Amiga from Commodore.
The 520ST and 1040ST were followed by the Mega series, the STE, and the portable STacy. In the early 1990s, Atari released three final evolutions of the ST with significant technical differences from the original models: TT030, Mega STE, and Falcon. Atari discontinued the entire ST computer line in 1993, shifting the company's focus to the Jaguar video game console.
Development
The Atari ST was born from the rivalry between home computer makers Atari, Inc. and Commodore International. Jay Miner, one of the designers of the custom chips in the Atari 2600 and Atari 8-bit computers, tried to convince Atari management to create a new chipset for a video game console and computer. When his idea was rejected, he left Atari to form a small think tank called Hi-Toro in 1982 and began designing the new "Lorraine" chipset.Hi-Toro, by then renamed Amiga, ran out of capital to complete Lorraine's development. Atari, now owned by Warner Communications, paid Amiga to continue its work. In return, Atari received exclusive use of the Lorraine design for one year as a video game console. After that time, Atari had the right to add a keyboard and market the complete computer, designated the 1850XLD.
Tramel Technology
After leaving Commodore International in January 1984, Jack Tramiel formed Tramel Technology, Ltd. with his sons and other ex-Commodore employees and, in April, began planning a new computer. Interested in Atari's overseas manufacturing and worldwide distribution network, Tramiel negotiated with Warner in May and June 1984. He secured funding and bought Atari's consumer division, which included the console and home computer departments, in July. The arcade video game division remained part of Warner. As executives and engineers left Commodore to join Tramel Technology, Commodore filed lawsuits against four former engineers for infringement of trade secrets. The Tramiels did not purchase the employee contracts with the assets of Atari, Inc. and re-hired approximately 100 of the 900 former employees. Tramel Technology soon changed its name to Atari Corporation.Commodore and Amiga
Amid rumors that Tramiel was negotiating to buy Atari, Amiga Corp. entered discussions with Commodore. This led to Commodore wanting to purchase Amiga Corporation outright, which Commodore believed would cancel any outstanding contracts, including Atari's. Instead of Amiga Corp. delivering Lorraine to Atari, Commodore delivered a check of $500,000 on Amiga's behalf, in effect returning the funds Atari invested in Amiga for the chipset. Tramiel countered by suing Amiga Corp. on August 13, 1984, seeking damages and an injunction to bar Amiga from producing anything with its technology.The lawsuit left the Amiga team in limbo during mid-1984. Commodore eventually moved forward, with plans to improve the chipset and develop an operating system. Commodore announced the Amiga 1000 with the Lorraine chipset in July 1985, but it wasn't available in quantity until 1986. The delay gave Atari time to deliver the Atari 520ST in June 1985. In March 1987, the two companies settled the dispute out of court in a closed decision.
ST hardware
The lead architect of the new computer project at Tramel Technology and Atari Corporation was ex-Commodore employee Shiraz Shivji, who previously worked on the Commodore 64's development. Different CPUs were investigated, including the 32-bit National Semiconductor NS32000, but engineers were disappointed with its performance, and they moved to the Motorola 68000. The Atari ST design was completed in five months in 1984, concluding with it being shown at the January 1985 Consumer Electronics Show.A custom sound processor called AMY had been in development at Atari, Inc. and was considered for the new ST computer design. The chip needed more time to complete, so AMY was dropped in favor of a commodity Yamaha YM2149F variant of the General Instrument AY-3-8910.
Operating system
Soon after the Atari buyout, Microsoft suggested to Tramiel that it could port Windows to the platform, but the delivery date was out by two years. A proposal to write a new operating system was rejected as Atari management was unsure whether the company had the required expertise.Digital Research was working on a new GUI-based system called Crystal, soon to become GEM, but was fully committed to the Intel platform. A team from Atari was sent to Digital Research headquarters to work on a port to the 68000. Atari's Leonard Tramiel oversaw "Project Jason" for the ST series, named for designer and developer Jason Loveman.
GEM is based on CP/M-68K, a direct port of CP/M to the 68000. By 1985, CP/M was becoming increasingly outdated; it did not support subdirectories, for example. Digital Research was also in the process of building GEMDOS, a disk operating system for GEM, and debated whether a port of it could be completed in time for product delivery in June. The decision was eventually taken to port it, resulting in a GEMDOS file system which became part of Atari TOS. This gave the ST a fast, hierarchical file system, essential for hard drives, and provided programmers with function calls similar to MS-DOS. The Atari ST character set is based on codepage 437.
Release
After six months of intensive effort following Tramiel's takeover, Atari announced the 520ST at the Winter Consumer Electronics Show in Las Vegas in January 1985. InfoWorld assessed the prototypes shown at computer shows as follows:Pilot production models of the Atari machine are much slicker than the hand-built models shown at earlier computer fairs; it doesn't look like a typical Commodore 64-style, corner-cutting, low-cost Jack Tramiel product of the past.Atari unexpectedly displayed the ST at Atlanta COMDEX in May. Similarities to the original Macintosh and Tramiel's role in its development resulted in it being nicknamed Jackintosh. Atari's rapid development of the ST amazed many, but others were skeptical, citing its "cheap" appearance, Atari's uncertain financial health, and poor relations between Tramiel-led Commodore and software developers.
In early 1985, the 520ST shipped to the press, developers, and user groups, and in early July 1985 for general retail sales. It saved the company. Atari ST print advertisements stated, "America, We Built It For You", and quoted Atari president Sam Tramiel: "We promised. We delivered. With pride, determination, and good old ATARI know how". By November, Atari stated that more than 50,000 520STs had been sold, "with U.S. sales alone well into five figures". The machine had gone from concept to store shelves in a little under one year.
Atari had intended to release the 130ST with 128 KB of RAM and the 260ST with 256 KB. However, the ST initially shipped without TOS in ROM and required booting TOS from floppy, taking 206 KB RAM away from applications. The 260ST was launched in Europe on a limited basis. Early models have six ROM sockets for easy upgrades to TOS. New ROMs were released a few months later and were included in new machines and as an upgrade for older machines.
Atari originally intended to include GEM's Graphical Device Operating System, which allows programs to send GEM VDI commands to drivers loaded by GDOS. This allows developers to send VDI instructions to other devices simply by pointing to it. However, GDOS was not ready at the time the ST started shipping and was included in software packages and with later ST machines. Later versions of GDOS support vector fonts.
A limited set of GEM fonts were included in the ROMs, including the ST's standard 8x8 pixel graphical character set. It contains four characters which can be placed together in a square, forming the face of J. R. "Bob" Dobbs.
The ST was less expensive than most contemporaries, including the Macintosh Plus, and is faster than many. Largely as a result of its price and performance factor, the ST became fairly popular, especially in Europe where foreign-exchange rates amplified prices. The company's English advertising slogan of the era was "Power Without the Price". An Atari ST and terminal emulation software was much cheaper than a Digital VT220 terminal, commonly needed by offices with central computers.
By late 1985, the 520STM added an RF modulator for TV display.