Editing Datamax UV-1

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[[Image:Datamax uv-1r.jpg|thumb|250px|Datamax UV-1R, with the associated analog breakout box on top]]
The '''Datamax UV-1''' is a pioneering computer designed by a group of [[computer graphics]] artists working at the [[University of Illinois Chicago]], known as the ''Circle Graphics Habitat''. It was primarily the brainchild of [[Thomas A. DeFanti|Tom DeFanti]], who was trying to build a machine capable of running his [[GRASS (programming language)|GRASS programming language]] at a personal computer price point, a project they referred to as the '''Z-Box'''. As time went on the project evolved into a machine intended to be used to make high-quality color graphics for output to [[videotape]], and later as a titling system for use by [[cable television]] companies. It represents what seems to be the first dedicated graphics [[workstation]].

DeFanti had been working at the Habitat for some time when, in 1977, he was introduced to Jeff Frederiksen, a chip designer working at [[Dave Nutting Associates]]. Nutting had been contracted by Midway, the [[video game]] division of Bally, to create a standardized graphics driver chip. They intended to use it in most of their future [[arcade game]]s, as well as a [[video game console|console]] they were working on which would later turn into the [[Bally Astrocade|Astrocade]].

Midway was not immediately interested in the [[home computer]] market, but the Nutting people managed to convince management to get DeFanti to port GRASS3 to the platform under contract. The idea was to build an external box that would be used with the existing console to turn it into a "real" computer, a system known as the '''ZGRASS-100'''. A number of people at the Habitat, as well as some from Nutting, worked on the project, adding a keyboard, memory, and additional connectors. A separate display chip created text, which was then mixed with the output from the display chip for the screen. Also included would be a new version of GRASS3, known as '''Zgrass'''. 

At about the same time, another version of the same basic parts was built as the '''UV-1'''. In this case the machine was built as an all-in-one box, including the small amount of additional hardware needed to support the high-resolution mode of the Nutting chipset, which supplied 320 x 204 resolution with up to 8 colors per line. This mode required 16 KB for the display buffer alone, so the machine included 32 KB [[Random-access memory|RAM]] and a larger 16 KB ROM with additional Zgrass commands in it. To this basic system the Habitat added high quality video output circuitry and a [[floppy disk]] interface.

Bally's intents for the UV-1 are not entirely clear. The November 1980 ''[[Byte (magazine)|Byte]]'' magazine contains an article by DeFanti (et al.) that seems to suggest that the ZGRASS-100 was already "dead", and that the UV-1 was intended to be used for high-quality video output. Ad copy from the same era suggests that Bally intended to sell the UV-1 as a [[home computer]], competing directly with the [[Apple II]] and similar machines. This makes the ZGRASS-100 somewhat unnecessary, so whether or not Bally intended to offer both remains a mystery. Either way, in 1980 Bally decided to exit the industry altogether, dropping both Z-Box projects, and the Astrocade too.

The final version of the Z-Box was the only one to be produced, as the '''UV-1R'''. This version was mounted in a [[19-inch rack|rack mount]] case (thus the R) with considerably more RAM and a 32 KB ROM which contained the parts of [[CP/M]] that were needed to boot the machine, so a disk was no longer required. Much of the additional RAM, up to 256 KB of it, was dedicated as a [[RAM drive|RAM disk]] so the machines could be installed and left running for years &ndash; a floppy disk would burn out very quickly in this role. The additional RAM was not normally visible to the [[Zilog Z80|Z80]] or the display hardware, but a new memory controller could switch in blocks of it so a number of screens could be [[cache (computing)|cached]] if the disk needs were not that large.

Although Midway had already given up on the Astrocade, they later sold the rights to the design to a 3rd party, Astrovision. Some time in the mid-1980s Astrovision decided to release the original "add-under" version of the hardware, now known as the '''ZGRASS-32'''. It is unclear if any were sold.

== External links ==
*[https://www.experimentaltvcenter.org/computer-animation-systems-grass-and-zgrass Computer Animation System using GRASS]

[[Category:Computer workstations]]