How many version of the HP Prime?

[rprosperi]

If you're trying to figure out how to use it in a similar way as using a 48G/49g/50g, or even an older RPN model, give up now, it simply doesn't behave that way and can't.

Which does not mean it isn't an excellent tool, it's simply made for very different usage, for high school education. And although people here have proven the Prime can do the most amazing things ever done on a handheld calculator, it still may not be suitable if your expectations are for a device that acts in the spirit of a traditional HP machine.

Times change, even if some of us don't want them to...