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HP Forum Archive 18

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HP-41 modules
Message #1 Posted by Matthias Wehrli on 20 Mar 2008, 4:38 a.m.

Hi

I just released a new version of my HP-41 module database. Feel free to download on:

http://www.hp-collection.org/Modulliste.pdf

Please, I'm also very interested in comments, additions, bug reports, ...

Matthias

      
Re: HP-41 modules
Message #2 Posted by Dale Ostrowski on 20 Mar 2008, 5:42 p.m.,
in response to message #1 by Matthias Wehrli

is there any way I can get a program on ohms law & pascals law ? Thank You Dale

            
Re: HP-41 modules
Message #3 Posted by Eric Smith on 20 Mar 2008, 6:24 p.m.,
in response to message #2 by Dale Ostrowski

Sure, here's a simple Ohm's Law program: 

01 LBL "OHMSLAW"
02 "I (AMPS)?"
03 PROMPT
04 "R (OHMS)?"
05 PROMPT
06 *
07 "E="
08 ARCL ST X
09 "|V"
10 END

(where "|" should be replaced by the append symbol)

            
Ohm's Law
Message #4 Posted by Karl Schneider on 21 Mar 2008, 2:54 a.m.,
in response to message #2 by Dale Ostrowski

Quote:
is there any way I can get a program on ohms law & pascals law ? Thank You Dale

Eric's HP-41 program incorporates the well-known E = IR for DC systems or where E and I are "in-phase" AC quantities (purely-resistive systems). We AC power guys prefer E = IZ, where E, I, and Z are all complex-valued, and Z = R + jX. Unfortunately, the HP-41 was not designed with built-in complex-number support.

-- KS

                  
Re: Ohm's Law
Message #5 Posted by designnut on 21 Mar 2008, 10:56 a.m.,
in response to message #4 by Karl Schneider

I deprecate the use of programs for simple matters. You can't put an education in a calculator try as you might. Practice makes perfect is the law you should remember. I remember Ohmite made cardboard Ohms rule slide rules. Sam

                        
Re: Ohm's Law
Message #6 Posted by Palmer O. Hanson, Jr. on 21 Mar 2008, 10:24 p.m.,
in response to message #5 by designnut

Quote:
I remember Ohmite made cardboard Ohms rule slide rules. Sam

I have two of those in my collection. One shows a 1949 copyright. The other shows a 1961 copyright. Both carry a price of 25 cents!

The features are the same including:

On the front side a 17 cm standard slide rule with A, B, C and D scales but without a cursor and a parallel resistance calculator.

On the other side an Ohm's Law Calculator which requires only one setting of the slide; for example, the user sets the ohms input opposite an arrow and reads the solution for various pairs of parameters from adjacent scales. Solutions include watts vs volts, milliamperes versus watts, volts versus milliamperes, watts versus amperes, and amperes versus volts.

                  
Re: Ohm's Law
Message #7 Posted by Eric Smith on 21 Mar 2008, 2:04 p.m.,
in response to message #4 by Karl Schneider

I can provide a 42S version for AC power analysis. :-)

                        
Re: Ohm's Law
Message #8 Posted by Karl Schneider on 22 Mar 2008, 6:05 p.m.,
in response to message #7 by Eric Smith

Quote:
I can provide a 42S version (of Ohm's Law) for AC power analysis. :-)

And I have no doubt that you can... :-)

It's just that, when I see Ohm's Law stated as "E = IR" (or "V = IR", if you will), I'm compelled to comment that such an expression is only a limited subset of the general-purpose equation.

The comment is meant only for general interest, though, not as a correction.

-- KS

      
Re: HP-41 modules
Message #9 Posted by J-F Garnier on 21 Mar 2008, 1:20 p.m.,
in response to message #1 by Matthias Wehrli

Hi Matthias,

Great work!

I have a few questions:
- Was the CCD B really provided in a CMT module, not a HP ROM module as for CCD A?
- I remember there was another version of the Ext-IL ROM (presumably older), the CAT 2 header was EXT IL1A instead of EXT IL ROM. I should still have a ROM image somewhere.
- Do you have ALL these modules? :-)

J-F

      
Re: HP-41 modules
Message #10 Posted by Karl Schneider on 23 Mar 2008, 4:28 a.m.,
in response to message #1 by Matthias Wehrli

Hi, Matthias --

That's quite an impressive list of plug-in devices for expanding the HP-41's capabilities -- a testament to the versatility of the platform.

Thank you for preparing it.

-- KS

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