I'm trying to write a very simple program for my 89 that acts in the background - and so cannot be detected if the calculator were to be handed to a random person. What I'm trying to do is, no matter what is put into the home entry line, a specific output is printed.
For example:
1+2 304
3+5+7+9 304
I have no idea how to approach this however, as I don't even know a way to A) run a program in the background like this or B) print to the homescreen as if it were a normal calculator function
And help would be much appreciated!


