IIRC DEC provided a very, very limited OS for PDP-6 called "MONITOR", which later survived long enough to be used as origin point for TOPS-10. The version as ar

IIRC DEC provided a very, very limited OS for PDP-6 called "MONITOR", which later survived long enough to be used as origin point for TOPS-10. The version as arrived with PDP-6 was very, very limited, which didn't help PDP-6's abysmal sales (especially coupled with infamaous unreliability).