Calculation of pi on many machines

[rprosperi]

Thanks for all your time doing the testing, documenting it all and sharing it here Benoit.

There's LOTS of real useful and interesting stuff just in the chart alone. Among them:

a. the 65 is faster the 67
b. the 41 is only a tad faster than the earlier machines and the 29 is faster still
c. the surprisingly high performance of the early Casio machines
d. the amazing speed of the DM42
e. the quite different slope of the 65 and 29 (gotta go read that in detail)

Looking forward to reading it in more detail.

Thanks!