I should have been more clear. I know the processor is z80, (though they could list it) the thing I'm curious about is the clock speed.
According to Wikipedia, it will be at least 15 MHz.
* several alternative high-level languages are available, though none of them is very popular: GFA-Basic, Newprog (probably one of the programs closest in spirit to Axe), etc.
Never heard of those 
What calculators are those for?
NewProg is for the 68k series. I'm not sure about GFA-Basic.