What was the first OS you've ever used?

[filibusterman]

3.1 but i guess thats pretty good since im only 22

 

[mike0219116]

I have no idea what it was called but it was the OS on the TRS-80 I got for Christmas in 1983.

 

[Diasper]

DOS and I think I must have been about 5.

I then didn't touch another computer properly for about 10 years after that.