Summation based benchmark for calculators

[Helix]

Sharp PC-1401 Basic
n=10 -> 9s result: 13.71183501
n=100 -> 91s result: 139.2971873

Sharp PC-G850VS Basic
n=100 -> 11s result: 139.2971873
n=1000 -> 102s result: 1395.346559

HP 50g HPGCC 2.0 - 75 Mhz
n=10000 -> 2s result: 13955.85790429154
n=100000 -> 23s result: 139560.8013952589

My comments:
I think the Sharp PC-1401 was the first model of this line combining a scientific calculator and a basic programmable computer, with a QWERTY keyboard. The PC-G850Vs is the very last one in this line. So it's interesting to see the evolution of speed between them.
The Sharp PC-G850VS is also programmable in C, but I've not tried this possibility. We lack a good English documentation.

HPGCC3 should be even faster than HPGCC 2.0, because it can switch the processor frequency up to 200 MHz. However I don't use it, because its installation and use are way too complex for me.