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@cstross @Infoseepage @Steveg58

It happens that I did some work on a similar system for the Tongan govt when I was living in Tonga, in the early 1980s.

MP/M was pretty nifty - the system I coded on, from a small Australian company, had shared disk storage, but a separate CPU board for each terminal/user, so users had no contention for RAM or CPU resources. That's quite the achievement for a system built on 8-bit CPUs!

Well into the '90s Tonga was still running the invoice app I wrote them.