HP-21 w. LastX. Possible? - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: HP Calculators (and very old HP Computers) (/forum-3.html) +--- Forum: General Forum (/forum-4.html) +--- Thread: HP-21 w. LastX. Possible? (/thread-16418.html) |
HP-21 w. LastX. Possible? - Matt Agajanian - 03-04-2021 04:04 AM Hi all. Given that the HP-25/25C has a LastX register and function, why was LastX omitted from the 21? Thanks RE: HP-21 w. LastX. Possible? - teenix - 03-04-2021 05:46 AM (03-04-2021 04:04 AM)Matt Agajanian Wrote: Hi all. The 21 came out before the 25's, and was similar in functionality to the 35. There is no external memory in the HP-21, only the registers in the ACT, one (M1) is the single memory location, the other (M2) register is for scratchpad use during calculations, the 6 others are the stack and display/scratchpad use. cheers Tony RE: HP-21 w. LastX. Possible? - Matt Agajanian - 03-04-2021 11:27 PM Thanks for the details. I didn’t realize that after the stack, scratchpad, and display, there was nothing left for a Last X reg. RE: HP-21 w. LastX. Possible? - Gamo - 03-05-2021 01:34 AM HP-70 don't have LSTx too. Gamo |