Null job light patterns?

I seem to recall RSX had a pattern something like 1000000000000001 1100000000000011 1110000000000111 1111000000001111 0111100000011110 0011110000111100 0001111001111000 0000111111110000 ... with the groups of four "on" lights moving through each other. RSTS (c. 1980) simply rotated half a dozen or so "on" lights. Others have described RT11's pattern. I never saw a light pattern on an '11 running Unix - perhaps they were never idle? Was the concept of the idle-loop lightshow unique to the PDP-11, or did other systems with data lights implement them? In high school I had a Sol-20, and I missed the "blinkenlights" so much that I cut away a strip of metal in the top of the case (near where the "Processor Technology" logo was) and mounted a set of LEDs on perfboard behind it. I sawed off the edge connector to a S-100 prototyping card and put it in the card extender slot at the top of the SOL's card cage, and ran wires from there to the perfboard. By changing the keyboard input loop to repeatedly access various addresses, I was able to get a reasonable emulation of the PDP-11 lightshow in the address lights. Decades later, I finally have a real '11 console to run the lightshows! http://www.saccade.com/writing/projects/PDP11/PDP-11.html Cheers, jp