Scientific calculators that have formula/equation memory

[Guenter Schink]

(12-14-2017 06:15 PM)Massimo Gnerucci Wrote:  

(12-14-2017 04:23 PM)grsbanks Wrote:  The 35S will lose its contents if you remove both batteries at the same time. They are connected in parallel (with a pair of diodes to ensure one battery doesn't feed into the other), so you remove and replace one, then the other, and your data stays intact.

The DM42 only has one battery. What you can do is save the machine state to flash memory then replace the battery. When you switch it on and if the battery was out for long enough for the machine to "forget" its contents, you can re-load it from the state file saved previously. So, the answer to your question for the DM42 is "yes, kind of". You have to save the machine state to flash, it won't do it automatically. The reason for the manual nature of this step is because you can save multiple state files that each include different "virtual machines" for different applications, eg. a state file with "financial" programs and data, a different "engineering" state file, a "programming" state file etc... You have to give the state file a name that reflects its purpose.

Or you can feed it via USB, methinks.

[edit]... well, no, or you cannot unscrew the back and change the battery... what a pity.

? You can remove the back cover and then connect the USB cable. Exchange the power cell. Just did it, it works!

Günter