We used GDDM and 3279 G (IIRC) displays to do preview of our plotter outputs (which were to pe printed on big electrostatic Calcomp plotters in the end).
The (most technical) software was written in Pascal and Fortran and built the output using a graphic software which was called GKS (graphic kernel system). GKS had two adapters, one for the Calcomp plotter and one for GDDM, so the output (GKS metafile) could be plotted and shown at the display station at the same time. Later we added an adapter to HPGL (HP graphics language) and bought some HP plotters. This was in the 1985 to 1995 time frame. After that, the applications moved off the mainframe, to Unix workstations. IIRC, some other companies here in Germany (car manufacturers) did similar things, in the same time frame. There were even some CAD like systems running on the mainframe. Kind regards Bernd Am 26.11.2017 um 21:01 schrieb Seymour J Metz:
What is "GDDM graphics", APA or PSS? -- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3
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