 Front view | |
| Also known as | ATW-800, ATW, Abaq |
|---|---|
| Manufacturer | Atari Corporation |
| Type | workstation |
| Release date | May 1989; 36 years ago (1989-05) |
| Discontinued | Yes |
| Units shipped | 350[1] |
| Operating system | HeliOS |
| CPU | 20 MHz T800-20Transputer |
| Memory | 4 MB ofRAM (expandable to 16 MB) |
| Graphics | Blossom video system with 1 MB ofdual-ported RAM |
| Input | Complete miniaturizedMega ST acting as anI/O processor with 512 KB RAM |
TheAtari Transputer Workstation (also known asATW-800, or simplyATW) is aworkstation class computer released byAtari Corporation in the late 1980s, based on theINMOSTransputer. It was introduced in 1987 as theAbaq, but the name was changed before sales began.[2][3][4] Sales were almost non-existent, and the product was canceled after only a few hundred units were made.
In 1986, Tim King[5] left his job atMetaComCo, along with a few other employees, to startPerihelion Software in England. There they began developing a new parallel-processingoperating system namedHeliOS. At about the same time a colleague, Jack Lang, started Perihelion (later Perihelion Hardware) to create a new Transputer-based workstation that would run HeliOS.
While at MetaComCo, much of the Perihelion Software team had worked with both Atari Corp. andCommodore International, producing theprogramming languageST BASIC for the former, andAmigaDOS for the latter. The principals still had contacts with both companies. Commodore had expressed some interest in their new system, and showed demos of it on an add-on card running inside anAmiga 2000. It appears they later lost interest in it. Atari Corp. met with Perihelion and work began on what would eventually become the Atari Transputer Workstation.
The machine was first introduced at the November 1987COMDEX with the name Abaq.[1][6] Two versions were shown at the time; one was a card that connected to the Mega ST bus expansion slot, the second version was a stand-alone tower system containing a miniaturized Mega ST inside.[7] The external card version was dropped at some point during development. It was later learned that the "Abaq" name was in use in Europe, so the product name was changed to ATW800. Perihelion remained the exclusive distributor in England. A first run of prototypes was released in May 1988, followed by a production run in May 1989. In total, only 350 machines were produced (depending on the source either 50 or 100 of the total were prototypes).[1]
The team in charge of the ATW's video system, "Blossom", would later work on another Atari project, theAtari Jaguar video game console.
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The Atari Transputer Workstation system consists of three main parts:
All of these are connected using the Transputer's 20 Mbit/s processor links. The motherboard contains four slots for addedfarm cards containing four Transputers each, meaning that a fully expanded ATW contains 17 Transputers.[8] Each runs at 20 MHz (the -20 in the name) which supplied about 10MIPS each. The bus is available externally, allowing several ATWs to be connected into one large farm. The motherboard includes a separate slot for one of the INMOS crossbar switches to improve inter-chip networking performance.
HeliOS isUnix-like, but notUnix. It lacks memory protection, due largely to the lack of amemory management unit (MMU) on the Transputer, although a number of measures are employed to reduce the possibility of programs interfering with each other. For example, when invoking a command pipeline, each program is distributed to its own separate processor, communicating with other programs using pipes that are implemented by hardware links. Where many programs may be deployed on the same processor, these processors will not in general be shared by programs belonging to different users.[9]
HeliOS is Unix-like enough that it ran standard Unix utilities, including theX Window System as the machine'sgraphical user interface (GUI). HeliOS can run on all of the Transputers in a farm concurrently, which allows all computing tasks to be fully distributed. Powering off an ATW does not affect the overall farm, and the tasks simply move to other processors on other systems.
Blossom supports several video modes:
Blossom also includes a number of high-speed effects (128 megapixel fill rates) andblitter functionality, including the ability to apply up to four masks on abit blit operation in a fashion similar to a moderngraphics processing unit's ability to apply several textures to a 3D object.
One oddity of the ATW is that it appears that the Blossom is responsible for the DRAM refresh, although the ATW includes such hardware internally.
The video architecture developed by Perihelion for the ATW formed the basis of a "high resolution video engine" expansion card envisaged for theTT030 workstation, connecting to the machine's VMEbus and supporting direct memory access transfers to and from system RAM.[10]
...Atari's Abaq computer is based on the Inmos T0800 RISC chip...
...The basic Abaq will cost between $4000 and $5000...
...a radical computing engine based on the Inmos T- 800 RISC processor. According to Atari president Sam Tramiel, the Transputer-based Abaq requires a 4-mega-byte Atari Mega workstation front end to handle I/O...
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