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The Z-Box was a [[raster graphics]] machine, unlike the original GRASS systems, so while most of the GRASS3 style was maintained in Zgrass, it added a number of commands dedicated to raster images. This included an extensive set of [[bit blit|bit block transfer]] commands in order to simulate [[sprite (computer science)|sprite]]s, something the hardware didn't include.{{sfn|DeFanti|1980}} The work would never be released by Midway, but the Circle would produce machines based on it as the [[Datamax UV-1]].
===GRASS RT/1===
The last version of GRASS was '''RT/1''', a port of GRASS to other platforms that divorced the language from the display model and allowed it to be ported to other platforms. Versions existed for [[MS-DOS]], [[Microsoft Windows]], [[Silicon Graphics|SGI]] platform using [[OpenGL]], [[HP-UX]], [[IBM AIX|AIX]], [[Mac (computer)|Macintosh]] and [[Amiga]]. The language remains similar to the earlier versions, so the reason for the change of name is unclear.
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