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Hello to all !

Are the X<>Z and X<>T functions present on a standard HP41 or HP41CV ? (which I no longer own).

Thanks for your reply.

Antoine M. "Kermit" Couëtte

Yes, the X<> function can be used to manipulate the stack.



Implements X<>T. The < and > alpha keys are located on the Shifted COS and TAN keys respectively.


Mark Hardman

Wonderful, Mark !

Thank you and Best Regards

Antoine M. "Kermit" Couëtte

Edited: 13 Dec 2012, 12:39 p.m.

The function sets of the HP-41C and 41CV are identical. The CV is simply a C that has four additional RAM modules built in.

Additions to funtionality came only with the 41CX, the best HP-41xx version by far. But unfortunately, it wasn't available until five years after the HP-41C was first introduced.

I assume that you are the "Kermit" who now and then posts on NavList. Funny how one runs into people.

AlanS at NavList

From London Heathrow on Dec 16th, 2012

Thank you very much Mike for your reply.


I have been a 30+ year user and (heavy) Programmer of the HP41CV/CX for which I just finalized a full 64K Celestial Navigation Software with its "NAVIGATOR's and ASTRONOMER's Guide" well underway by now (at last)...

I earlier developed all this Software on the RAMBOX II made by W&W Software GmbH (Germany). The HP41CY - incorporating a RAMBOX II inside its casing - was an AMAZING extension to the HP41CX. (I am also aware that there were other equivalent RAM boxes on the market by that time then, and that a "new, much improved and much faster" HP41 has come to life most recently as it has been extensively addressed on this HP Forum). In the last 10 years or so I have entirely switched the development of all my Navigation Software onto the "magic" HP41X/Y/Z Software by HrastProgrammer running on the HP48GX/49G/50, as well as onto the equally "magnificent" Emu41 Software by Jean-François Garnier running INCREDIBLY FAST under MS-DOS.


I no longer have my HP41CV/CX documentation with me since I now live in Mauritius where I fly the A340-300. Somebody has got to do it :-) !


In addition to all the TIME Module Functions of which I already have a comprehensive list, would you then mind indicating to me which are the specific HP41CX functions which were added to the "standard" HP41C/CV inventory. This list is not very important, and as I can recall we find in it the "X<>Registers" exchange Function.

Thanks to you Mike, in advance for your Kind Understanding and for your reply

Best Regards

Antoine M. "Kermit" Couëtte

From London Heathrow on Dec 16th, 2012

Hello Alan,

Yes ... its loooooks very much like being the same "Kermit" indeed !

Had I not first been able to develop own HP41 Celestial Navigation Software, I most probably would not have later joined up our Excellent NavList Forum which I am strongly recommending to all HP Forum Members interested in Classical Navigation.

If you want to know more, it's all there :


Best Regards,

Antoine M. "Kermit" Couëtte