@natecull 2.1 which came in /286 and /386 flavours. https://en.wikipedia.org/wiki/Windows_2.1x Say “above the line” and “below the line” to programmers of that era and watch them break out in a cold sweat.

Apparently there was also a 2.11 version but I don't remember that. And, why's 11 the next number after 1?