win 3.1 was released in early 1992. It looks like it was Dos 5.0 and 6.0 by then. https://en.wikipedia.org/wiki/Timeline_of_DOS_operating_systems https://en.w

win 3.1 was released in early 1992. It looks like it was Dos 5.0 and 6.0 by then. https://en.wikipedia.org/wiki/Timeline_of_DOS_operating_systems https://en.wikipedia.org/wiki/Timeline_of_DOS_operating_syst...