HP calculator geneology

[cyrille de brébisson]

Hello,

I fully agree with those saying that the diagram is at least partially incorrect.

The HP71 is an ancestor of the 48 series as most of the math code (real math function) was created for the HP71. So there is a link missing there.

The 19 and 17 (and 18?) are also linked with the 48 as they are RPL based.

Now, it is true that the question is confusing. Are we talking about a technical derivation or a function/feature derivation? this probably would yeild to 2 different graphs.

cyrille