Some good calls! Actually, it is 2.11 BSD unix at the top and RSX-11M Plus at the bottom. But I had forgotten... RSTS-E has a pattern like BSD, see below. So -1 point for me for forgetting that. RSTS-E is underappreciated in the PDP-11 retro world! Here it is... Tweet added by Oscar Vermeulen @Oscar_CEDS

Oscar Vermeulen

6 months

Some good calls! Actually, it is 2.11 BSD unix at the top and RSX-11M Plus at the bottom. But I had forgotten... RSTS-E has a pattern like BSD, see below. So -1 point for me for forgetting that. RSTS-E is underappreciated in the PDP-11 retro world! Here it is...

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Oscar Vermeulen

@Oscar_CEDS

6 months

Blinkenlights, 't is the season! You can recognize a PDP-11 operating system when the machine is idling. One is running a vintage unix, the other a DEC OS. But which is which? Extra hacker creds for recognizing the exact unix version & specific DEC OS :-) #PiDP11

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Amanda Treefield

@AmandaTreefield

5 months

@Oscar_CEDS I used to work for Systime in Leeds. RSTS/E was very familiar to me.

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maddog Hall

@maddoghall

3 months

@Oscar_CEDS I taught students at Hartford State Technical College from 1977-1980 on a PDP 11/70 running RSTS-E with 13 terminals and an RP06 disk drive. We taught them BASIC-PLUS, Fortran IV, and PDP-11 assembly language on that machine. Most students had never seen a computer before that

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