[Info-vax] What are the earliest DEC operating systems you worked with ?

[Bob]

DOS-8 and PS-8 (later OS/8) on various PDP-8s in college. 1972

My first home computer was the Heathkit HT-11 running RT-11 V2 and V3

When I started working for DEC in 1980, I became the Version 4 person.
OS/8 was at 3D and never went farther, but that's where I started.
RT-11 when V4.0 was released
RSX-11 when V4.0 was released
VMS when V4.0 was released