The Family Tree


Hello all,

Is there a diagram that shows the lineage of HP calculators. I'm particularly interested in seeing which calcs were the descendants of which. For example, in the 1978 Buying Guide, the HP-31E was advertised as the descendant of the HP-21 (which was the successor to the HP-35).


Edited: 31 Mar 2012, 5:13 p.m.


Uhm, yes, that is sort of available on this site. Just go through the museum pages. At the bottom of each calculator page you find a link to the next and previous one made. Also in the discription you will find which model it replaces or how it relates to others.


José Gonçalves has prepared one:



thank-you for sharing the tree, Gerson

Edited: 31 Mar 2012, 5:56 p.m.



I should have mentioned the author had announced it in this old posting.



Now, THAT'S a tree! You're right! I'm enjoying this!! Funny thing--as I'm looking for the codenames, I didn't realise that those are in the 'Collector's Corner' section here.

Edited: 31 Mar 2012, 9:55 p.m.


Remember that we might like thinking of it this way, but in fact each product is simply a product placed in the marketplace. IT may have been observed to follow a pattern (e.g. 11c 32s 32sii 33s 35s) and we might have some anecdotes, but really, there is no actual family tree :-)



Yep, you are correct. The family tree itself shows a reverse natural pattern (wow! RNP...): the tree comes after its fruits.


Luiz (Brazil)

Edited: 31 Mar 2012, 8:01 p.m.


In Italy we say : "è nato prima l'uovo o la gallina?", it means : was born, first, the egg or the hen?

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP-10C Series Family Photo Max Stone 5 1,818 10-24-2013, 10:31 PM
Last Post: Eddie W. Shore
  Christmas tree simulator on HP39gII Mic 0 812 12-08-2012, 07:19 AM
Last Post: Mic
  DM-15CC family is available to order Jeff Johnson 35 7,073 07-07-2012, 05:20 AM
Last Post: Pascal
  Function Tree for HP48/et al. Thomas Chrapkiewicz 3 1,024 10-08-2010, 03:52 PM
Last Post: Jean-Michel
  HP 41 Family Service Manuals Gerry Schultz 4 1,480 05-20-2010, 02:10 PM
Last Post: Gerry Schultz
  HP-12C family Antonio Maschio (Italy) 2 839 11-29-2007, 02:22 AM
Last Post: Antonio Maschio (Italy)
  HP48 diagram/tree for function location Angel 3 926 02-12-2005, 09:18 PM
Last Post: Raymond Del Tondo
  The RPL family jose goncalves (Brasil) 0 555 08-21-2003, 07:59 AM
Last Post: jose goncalves (brasil)
  Speed on the 41 family Silvio 5 1,046 01-24-2003, 08:29 AM
Last Post: Daniel Diggelmann
  A new family tree for HP calculators Jose Goncalves 1 669 10-14-2002, 02:26 AM
Last Post: Erik Ehrling (Sweden)

Forum Jump: