Hi, i'm trying some programs on my newly ressucitate HP-25 and need some help : how can i add some lines to an existing program. I found how to replace a line but not how to insert a new one.
What is the purpose of "suffix" key?
The case and the keys of my calculator is beige-yellow color : on the museum photo, keys are white keys : Is is a variation scheme or due to discoloration :-(
I also read about possible power dammage to this unit and Zener diode but i can't find a post that "resumue" the issue : What diode to use and where to connect it in order to protect the electronic?
Thanks
Michel