I have noticed in the MoHPC software library we find precious few 33S contributions. This is not surprising--with the "hard cap" on storage registers and labels, it makes it hard to write really powerful programs of much complexity, even though one would think the speed of the 33S would encourage programming. I have one routine that computes the incomplete gamma function on the 33S in about a second or less. The same routine on the 42S is somewhat slower, the 41CV version is slower yet, and the 11C/15C version can take the better part of a minute for typical arguments.

I hope that the 35S will open up new vistas for RPN programming, with its 800+ registers and XEQ and GTO by line address and not just alpha labels. The programming environment isn't nearly as comprehensive and flexible as that of the 41 series or 42S, but the calculator is still a lot faster than its forebears (even if it is slower at times than the maligned 33S), and this I think should inspire a flurry of interest in porting routines from 41 series, 42S, 65, 67/97, the Spice series, etc., as well as creation of new ones.

The one drawback is the lack of I/O, and I can see that most will not want to key in a 500 step program. That said, there is a lot one can do in smaller programs--Gerson's recent cosine and tangent routine is an example of a tight fast program that is well suited to the 33S (and 35S too).

When I get my 35S, I will start the ball rolling. I have already pledged to Dave Hicks that I will contribute programs to compute the incomplete beta and gamma functions and well known special cases of these (like the error function, cumulative normal distribution, t distribution, F distribution, and chisquare distribution). I do have 33S versions of these but they gobble up almost all of the labels. I have in essence ported the routines from Numerical Recipes, and my work is therefore a little different from those offered by JM Baillard in the HP41 Software Library, though I give JM considerable credit for inspiring me to program the special functions in RPN, UserRPL, and SysRPL.

Is anyone else working on something with their 35S that they would like to share, either here, in an article, or in the Software Library?

Les

*Edited: 26 July 2007, 12:43 a.m. after one or more responses were posted*