Oddest mismatch in hardware for a given purpose...

I have in my grubby little hands an Elektronika MK-85 calculator, which externally is a spot-on clone of the Casio FX-700P BASIC programmable calculator. Functionally, it's identical as well, with a few enhancements (pixel-addressable graphics, a Cyrillic character-set, etc) Internally though, they're 100% different -- the processor in the MK-85 is a Russian PDP-11 knockoff. It's not a power-efficient CPU by any means, so to ensure decent battery life the CPU speed is severely limited. Not sure exactly what speed it runs at (anyone out there know?) but the result is by far the slowest calculator I've ever used. Computing the sine of an angle in degrees using the built-in "SIN" function takes anywhere between 2 and 7 seconds by my stopwatch. So the MK-85 takes an otherwise-elegant and useful 16-bit CPU, attaches it to a mere 2K of RAM and 8K of ROM and runs at an insanely low clock speed in order to allow the battery life to be more than a few minutes... I just have to wonder why they decided to go with a PDP-11 clone over, say, a Z80 clone... :). (The BASIC implementation is also incredibly buggy, mostly due to poor argument checking... see http://www.pisi.com.pl/piotr433/mk85mc1e.htm for a cool example of exploiting a bug in INPUT to do machine-language coding, in a way only a contortionist could love...) I just find this machine fascinating, for a number of reasons. A handheld PDP-11! (Sort of.) Anyone else know of examples of odd-duck machines like this, where the hardware is probably not the best choice for the application? (But it's cool anyway?) - Josh