HP 15C and INT(1/√(1-x),0,1)

[Dieter]

(01-17-2018 05:41 PM)Mike (Stgt) Wrote:  Why? -- I ran the 8-Queens programs for the HP41 and HP15C you find in here on a 'firmware interpreter' to count the MCode instructions (not the user program steps). When - for the HP15C - I find 18,210,956 MCode instructions and divide it by the ~3950 MCode instructions per second you named I get 4,610 seconds or 1 hr and ~17 min what is within 2 minutes of the value shown in the a. m. link.

The numbers seem plausible, but this does not neccessarily mean that the calculation is correct. ;-) I still wonder if the 15C really is that slow. Compare it to the 34C: the two given programs are virtually identical (the 15C version even requires one step less) but the 15C is slighty slower. The 34C was my first HP calculator, so I know that it is not very fast and slower than the HP67. But is the 15C really even slower?

Maybe someone with a physical (and original) 15C can try the program listed on the linked webpage and see if it really takes almost 80 minutes to finish.

Dieter