Yes! TI Basic on my Texas Instruments graphics calculator was how I spent downtime during math class.

So much so, I remember writing program for solving quadratic equations.

They were supposed to clear the calculators memory during exmas, but the exam invigilators had no idea what calculators could do, so they didn't.

I'd like to think it wasn't cheating... as writing quadratic solver in TI basic is harder than solving simple quadratic equations. And I did do them all by hand anyway in the exams...