HP-25 Two Variable Statistics

[Steve Simpkin]

(09-05-2022 04:18 AM)Matt Agajanian Wrote:  ...
Is it correct to presume that when the 19/29 came about, HP had the technology to be able to incorporate several high level features--now two-variable state, indirect addressing, 98 program steps, 30 registers, three subroutine levels, labels, etc.? I presume when the 19/29 were developed, the technology was able to create such higher functionality in their calculators.

All of the features you mentioned (more or less) were present in one or more of the HP-65, HP-55 or HP-67 programmable models which were introduced before the HP-29C/19C so the technology for those features did exist previously at HP.
https://www.hpmuseum.org/cgi-bin/compare...ne&diff=ON