said by Mark12547:At least it isn't like some mainframe upgrades I did back in the 1980s where we had three disk packs we mounted to generate a new version of the operating system, ...
... Or use a pressure pad console to type hex instructions to mount an outboard diskette drive to a Series one so you could patch or install features to EDX. The parking garage setup I serviced used the diskette drive as a sort of virtual memory since that model only had 16KB memory. The diskette and R/W head would wear out, so the drive and diskette had to be replaced before the garage system could be operational. We kept a spare drive and diskette on site.
They were used at Kmart, State Farm, Lowes, on aircraft carriers, Lewis Space Center in Cleveland, in parking garages, door access control, industrial control and monitoring systems etc.
You might find those buggers in the oddest places - like the one I serviced that was located in an office bathroom. I had to sit on the toilet to work on it.
I recently saw where they were still in use on submarines as late as two years ago.