![]() For example, versions R1 thru R3 came out one every month or so, until R4, which actually was pretty stable and was the supported version for a good full two years, until the very end of 1979 when McAuto (by that time United Computing had been completely taken-over by McDonnell Douglas) released Unigraphics D1 (the 'D' standing for 'Double precision'). It wasn't until 1978 with the release of Unigraphics R1 (the 'R' stood for 'Restructured') that a formal release procedure was put in place where everyone got the same version until the next release was sent out, and in those days, while you could technically 'patch' an executable, there were no formal maintenance releases, just new versions shipped whenever. If they installed a system one week and another one the following week, they most likely got two different versions of UG. Yes, when I started using Unigraphics back in 1977 we didn't have version numbers.
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