Valentin Albillo's "Boldly Going... Going Back to the roots" now for the HP-41 !

[Vincent Weber]

Thanks Angel, very interesting!
Knowing that my "HEPAX trick" was not available back in the day, well at least until 1988 which is very late in the '41 life, I made a version using the Advantage pack complex routines. At least they were available in a ROM module (so you can use XROMs) by 1985.
I got consternated by the results. As slow as with JMB routines when they reside in main memory, so with the global searches! These routines are terrible, using up to 4 registers, plenty of calls back and forth, not optimised the slightest bit, unsuitable for loops. JMB routines are also in user code, but at least he bothered to make them straightforward and reasonably fast.
It is a really pity that the Advantage pack does not contain the full 15C functionality in MCODE. If HP could commission Firmware specialists to adapt the 15C SOLVE and INTEG routines for the '41, why not going all the way, and also adapt the complex stacks (improved with complex STO and RCL), hyperbolics, Gamma, combinations and permutations, and random numbers?
The matrix routines on the Advantage pack are outstanding, more powerful than the 15C, but they were made by the CCD, not by HP.
This Advantage ROM is a half-baked product, too little too late. Hp was already showing signs of decadence by 1985...