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In August 1981 we had a persistent problem with the RP06 on our PDP-11/70 crashing disks. It even crashed once while the DEC repairman was standing next to it trying to figure out why the previous pack had died. We collected a few dead packs, and they were forming a pile. Lillian, never one to miss an opportunity, suggested building a mobile. ...
My film scanner has no holder for 16mm film, so these were made using a digital microscope. Given the appalling quality of the negative, it was more than up to the task.
@robpike Man, I was in university working on a PDP-11 at the same time. I loved that machine even though a lot of the design decisions would seem weird today, like keeping the registers in memory (which was great at the time).
It was funky - wiggle the light pen interface and it would reliably crash every time - but it still changed my life.
Some earlier DEC machines (PDP10, probably PDP6) had the registers at memory locations 1 to 16. This meant you could load the tight loop of your program into the registers and execute there.