Bonjour JF !
jeffcalc wrote:It's always interesting to document internal algorithms.
It was interesting to make out from several trace logs for what purpose is this and that code section. Until few hours before the goal I was still prepared not to get there. The "documentation" or let's say description was my time to enjoy my victory.
A major portion of this victory is based on the free emulators for classic HP calculators,
MultiCalc+ from Tony Nixon and the one of Bernhard Emese well hidden in his
Low Power Connectivity Kit. There are few minor differences (not worth to mention), that made me use only Tony's program. May be I was only
accustomed to it for
some days longer.
Another big thank you to whom it may concern -- who picked the ROM content off the HP-32 (Eric Smith done it?). Without ROM copy no virtual remake would run.
I believe the Q-1(x) function is made by solving x=Q(y) for y, so there is a kind of solver in the 32E.
This is highly likely. But I do not analyse it, I leave it as an exercise for others
I am done.
Is there any 41 module (HP or custom) than implements the Q Q-1functions? (I don't think so)
Well, may be one of the 1015 modules or backward incompatible updates from Ángel Martin, who knows. Frankly, I am not interested. This "translation" of the Q process to a formula was my last big effort with pocket calculators.
<< J'ai fait tant des projets qui sont restés en l'air... >> -- tu le connaît peut-être. https://youtu.be/bHokx2L1wi4Anyway, it may be a good candidate for my own HP71 Math ROM 2 project
I programmed
Q as HP32 in user language on a HP-42S (under Emu42), attached. It offers few digits more to the user than HP-41, Voyagers, HP-67 or similar, on those machines you have no chance to enter the constants completely, in addition each intermediate step is rounded to 10 mantissa digits, so you will not be happy with the results compared to an HP-32E. On an HP42 the results are more accurate but still differ every now and then. May be rounding the result to 10 digits could ensure the same result as on the ancient Spice model.
Mille kilos de m... pour ton HP71 Math ROM 2 project! I keep my fingers crossed.
Bien cordialementM.
Edit: removed attachment, find a correction in another thread.