Casio Pocket Calculator CPU Question

[DenverGuy]

This is a little nerdy, but I have always wondered what kind of CPUs basic calculators use. There is no way to identify them, as they now just look like a black blob. I use the calculator in the photo a lot and it's pretty good.
I was wondering if the processor really IS a CPU and if it has some of the basics of a computer CPU with an ALU, control unit, etc.
And is there a way to find out more about the cheap units used in basic calculators? I am always interested in what's going on under the hood.
Thanks.