Yep! That’s how I started too. The student teacher installed a bunch of programs for us, and I started editing them and making my own games, like black jack. In high school, I modded my calculator with custom firmware that allowed you to cut/copy and go to lines when editing a program instead of holding down an arrow. I used this a ton as I was making a poker program that used the graph to draw the cards out. It took over half of the RAM, and I regularly backed it up. My calculator crashed hard and couldn’t boot up, so I wasn’t able to finish it.