This also cropped up recently on hackaday:
   http://www.calcwatch.com/

PIC24 based scientific calculator in watch-sized module. All open  
source.  Available as a kit.  100 Hours of runtime on 2xcr2032  
batteries.  Runs at 250kHz.

Uses Microchips C30, which apparently includes 64bit floats (makes  
sense; it probably uses a generic Gnu floating point library.)

Personally, I hate it when I find someone has already done the  
pointless project I had in mind (and gone further than I had intended  
on going.)  The whole point of doing something pointless was to be  
unique.  Sigh.

BillW

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