Continuous Memory


Hello fellow HP enthusiasts.

I know that the first HP calculator with Continuous Memory was the HP-25C. However, does anyone know if this was the first calculator to ever to have continuous (aka constant) memory? Or did TI or another calculator manufacturer introduce this featuer prior to the HP-25C?

Thanks for everyone's input.



If you're not concerned about the exact implementation, the HP-9100 had memory that was actually far more "continuous" than the HP-25C. I should add a note on that to the timeline.


Dave is right. The HP 9100 used core memory and it would hold it's contents even with no power. I have one and it's quite strange to turn it on and see everything still there. BTW the HP9100 dates from 1968.



Thanks for your responses.

But when was continuous memory introduced on a handheld calculator?



I'm not sure of the timeline (and who was first), but I know that at roughly the same time TI came out with the continuous version of the ti-58 I think. (This was the non-card programmable version of the ti-59.)

Shortly after, HP came out with the HP-29C which I bought. (And then I bought the HP-41C and so on...)

Possibly Related Threads...
Thread Author Replies Views Last Post
  HP8925A - Continuous BEEP and garbage display mark stephens 3 607 08-03-2013, 08:54 AM
Last Post: Rik Bos
  200LX problem: Insert batteries and get a continuous beep... ideas ? Gene Wright 8 1,234 06-19-2013, 04:52 PM
Last Post: gene wright
  41 User Memory vs System Memory Gerry Schultz 6 1,016 07-01-2012, 12:02 AM
Last Post: Monte Dalrymple
  HP 10B continuous memory hpnut 8 936 05-31-2011, 05:12 PM
Last Post: Tim Wessman
  Font for HP-25 "Continuous Memory" logo Steve Lidie 3 627 01-23-2011, 04:23 PM
Last Post: Andrés C. Rodríguez (Argentina)
  41cx long continuous memory hal 4 603 02-13-2006, 01:22 PM
Last Post: S. Heddle
  HP-25C Continuous Memory Calculator Alex 1 385 06-19-2005, 02:45 PM
Last Post: Andrés C. Rodríguez (Argentina)
  hp 34c continuous mem Herbert Markle 5 760 03-31-2004, 12:32 PM
Last Post: John Smitherman
  Stack Holding in Continuous Memory Calc Katie 5 664 05-14-2003, 04:31 PM
Last Post: David Smith
  Have memory, and getting "insuf memory" err mssg. Jes 1 406 04-02-2003, 05:41 AM
Last Post: James M. Prange

Forum Jump: