I spent my second BlackFriday bonus on a CASIO CP400 graphing calculator.
It's big calculator with a very nice LCD, and powered by a ~50 Mhz SH4 CPU, downclocked a bit to save power.
Unfortunately there is no SDK available from CASIO, you cannot develop and run your own applications.
But nothing can stop you from hacking the firmware, writing a loader (S19?) and having fun.
How to spend time during Christmas holidays. Anyone?
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)