Comment CP/M was my start (Score 1) 413
I had a little Z80 based CP/M system with 8" floppies back in the early 80's I think, moved on to a Z-System box (file paths and other useful innovations) then on to WinNT. Then I found Suse Linux and used that till about 2001 when I got my first OS X box and that's where I have remained.