> > My recollection is that most CP/M programs were configured via patching.

> Huh. That is interesting, it was before my time, and I never heard of this :D

Yep, it was a thing, and for /some/ programs that were originally CP/M programs (i.e., WordStar 7.0 for DOS) it continued for a long time. The WordStar 7 documentation included patch locations to use (this time, IIRC, for DOS debug.exe) to change various behaviors of the program.