Does the calculator necessarily be reset after every calculation by way of pressing 2nd Reset enter or is it enough to just clr work and or on /off and move on??
Are you using the HP12C? Whether or not you need to reset, and how much, depends on how much of the memory stack & memory cells you want to clear. Pressing on/off won’t do the trick. Check the user manual for details.
I have a TI BA II Plus Professional…