50g

Hi!
I'm new to develop program for calculators, 
(but not new to development otherwise).

I was join this group becurse i am planning to by a HP50
i rely misses RPN)

My first program i like to make, is for my son to traning
math, eg get question like 4*5=?
Is this a god task to 50g ?

Many years a go when i looked att development för calculators 
you have to enter program direkt to the maskin, same to day ?
or can a write on PC and transfer ?

Stupid question, but i hope some have time to help me
figure this out.

Happy for anyting else, links, tips etc 

Best regards
Anders