Add to them the Pioneers' series.rudi wrote: ↑Fri May 06, 2022 11:05 am
I will dare to make one more post in this loose guessing and speculation thread. I missed out, that Michael said "saturn CPU".
According to https://en.wikipedia.org/wiki/HP_Saturn, the following models had a saturn CPU:
HP-71, HP-18, HP-48, HP-49, HP-39, HP-40, HP-50
Much more on target as an entry level RPN calculator.