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I have an HP-25 that has a programming problem. When I first received the calculator it did not have this issue.

The issue: when I go to PRGM mode any step I enter reults in a 'GTO 00' command. If I press any of the shift keys the display will show that it is in shift mode but when I click on another key it just puts GTO 00.

Any ideas?

- Fouad

you have a 25 with a bad RAM chip.
The only source of spare parts is another 25 with other issue.



Tkanks Ignazio. Do you know which is the RAM chip so I can make the transplant?


It's marked 1820-1564.


Thanks .

I just hope the other one is working.