I've heard of libraries that are still working with custom software on Apple IIs as circulation terminals. I forget exactly what they were using as a server, quite possibly that was also an Apple II. Although I don't know how many patrons they were serving or how big their collections were, because I can imagine handling even a moderately sized library collection with even just a hundred patrons would get really tedious really quick. (Actually, the example used to be on the KOHA website, or in a LinuxJournal magazine I bought long ago, I thought.)

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