Poll: Landscape or Portrait?

[rprosperi]

(03-04-2016 12:02 PM)striegel Wrote:  Quite right: these do not use any HP ROM (according to the developer). Running programs produce the same results as a real HP-12C. I've tested the 'Program to Structure Gross Pretax Lease Payments' from page 54 of the HP Leasing Applications Handbook and it matches completely.

What would be a really demanding test case?

For built-in functions, I believe solving for Interest (which is usually iterative) would involve the most internal calculations and thus reveal the propagation of rounding errors (errors meaning compared to a real 12C - it's possible this version is actually more accurate than a native 12C).

You could also build and run some simple programs that calculate in a large loop and compare with a real 12C. Also the ASIN(ACOS(ATAN(TAN(... test could reveal inaccuracies as well.