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There is also this: https://archive.org/details/DBaseIIISpecialEducationalEdition1985BoydFraser, which comprises a set of working dBASE III application files and can be overlaid upon an otherwise non-working dBASE III r1.0 install - without the associated problems regarding 286+ processors, etc.
To quote: Special educational version of (dBASE III(R)) for use with the IBM PC, XT, AT, and compatibles. Copyright 1985 (Ashton-Tate). All rights reserved.
As I understand it, this was a special version created to go with a Boyd/Fraser book, and has no copy protection. No idea how "cut-down" this might be relative to a proper working r1.0 though
I used this to get an (apparently) functioning dBASE III app running under a suitably "PIF-ed" CMD window on a VirtualBox Windows 2000 VM - so I guess that means it doesn't have an 80286/80386 problem, whereas I could not get the r1.0 copy to work - as it neither likes 80286/80386 nor emulators.