The Museum of HP Calculators

HP Forum Archive 11

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HP-25 program line
Message #1 Posted by Michel Beaulieu on 20 Mar 2003, 10:14 p.m.

Hi, i'm trying some programs on my newly ressucitate HP-25 and need some help : how can i add some lines to an existing program. I found how to replace a line but not how to insert a new one.

What is the purpose of "suffix" key?

The case and the keys of my calculator is beige-yellow color : on the museum photo, keys are white keys : Is is a variation scheme or due to discoloration :-(

I also read about possible power dammage to this unit and Zener diode but i can't find a post that "resumue" the issue : What diode to use and where to connect it in order to protect the electronic?

Thanks Michel

      
Re: HP-25 program line
Message #2 Posted by Ernie Malaga (Miami) on 20 Mar 2003, 10:26 p.m.,
in response to message #1 by Michel Beaulieu

Michel:

>I found how to replace a line but not how to insert a new one.

Unfortunately, the HP-25 has no insert/delete capabilities. The only way to do what you want would be to GTO nn (an unused program lline), then after the lines you want to insert, do GTO nn to go back to the line immediately after the first GTO. It's not efficient, but it does the job.

To "delete" a line, you can replace it to a NOP.

>What is the purpose of "suffix" key?

I think you meant PREFIX. If you mistakenly press any of the prefix keys (f, g, STO, RCL, GTO, whatever), you can press [f] [PREFIX} to cancel it.

>The case and the keys of my calculator is beige-yellow color : on the museum photo, keys are white keys : Is is a variation scheme or due to discoloration

Most likely the latter.

-Ernie

            
Re: HP-25 faceplate...
Message #3 Posted by Michel Beaulieu on 21 Mar 2003, 4:32 p.m.,
in response to message #2 by Ernie Malaga (Miami)

You are probably right : it's prefix... I have no writing at all on my claculator, all is erase except the keys themselves. It's not even written anywhere the model number : The front letters are erase too. It is possible that it'S not a HP-25 - It looks like the photo on the museum but is there other similar model than the HP-25?

How can it be possible that the calculator have not writing AT ALL, not even some small paint is still observable on the faceplate but all the writing on the keys ar like new...

I don't think this calculator is a collectable one but it's very fun to use, i like the size of it : I there some program available for it somewhere?

Thanks again

                  
Re: HP-25 faceplate...
Message #4 Posted by David Smith on 21 Mar 2003, 5:28 p.m.,
in response to message #3 by Michel Beaulieu

It may be an HP21. See if it matches the HPMUSEUM photos. Some of the HP25 (especially the 25C) have problems with the silkscreened legends on the keyboard washing off. Seems to be related to certain production runs. Mostly affects the top row or right column of keys.

                  
Re: HP-25 faceplate...
Message #5 Posted by Vieira, Luiz C. (Brazil) on 21 Mar 2003, 9:37 p.m.,
in response to message #3 by Michel Beaulieu

Hello, Michel;

nice reading your posts here.

I have an HP25 and I am a lot curious about yours. Did you get success entering in Program mode?

There are two switches above the display: on is to switch it to ON and OFF and the other should work ans PRGM/RUN switch. In the HP21, the second switch selects RAD and DEG angular modes.

If you entered in Program mode, yours is an HP25 or HP25C: they are exactly the same except for the Continuous Memory inscription in the keyboard's faceplate (bottom) and the "C" letter in the calculator's ID.

If it is a collectible? All woodstocks are collectible items, any of them. Some are rarest them others, but all of them are rare as for being Woodstocks.

Good luck! And best regards.

Luiz C. Vieira - Brazil

(I did not forget your request about HPIL)

                        
Re: HP-25 program mode
Message #6 Posted by Michel Beaulieu on 21 Mar 2003, 10:04 p.m.,
in response to message #5 by Vieira, Luiz C. (Brazil)

I again lost your email due to computer failure... i have more good calculators than good computers - strange choice...

Yes i can enter the program mode but i have a problem : all the last 2 rows of keys don't enter code in my program they just shows me the x display while push in. these keys are working well in RUN mode but strangely in PRGM mode.

So it's not a 21 but perhaps a 25C, i don't know yet...

I really like the "baby" size of the calculator! And with fres batteries i can run for 4 to 5 hours : compare with my TI-58 less than 1 hours it's great. I always love LED calculator but DISLIKE the battery lifetime. With the 25 i think i reconciliate with LED calculators, i'll use it at school insted of my 41.... just for a while... :-)

A dreamy calculator should be a LED one with great conservative powers needs, continuous memory and some of my 41 feature i like most... Does it exist in TI of HP? The 58C is good but battery life is very bad...

Just write me a message so i can restore your email!

Thanks Michel

                              
Right here!
Message #7 Posted by Vieira, Luiz C. (Brazil) on 21 Mar 2003, 10:21 p.m.,
in response to message #6 by Michel Beaulieu

Be my guest, my friend! ;-)

            
Re: HP-25 program line
Message #8 Posted by David Smith on 21 Mar 2003, 5:26 p.m.,
in response to message #2 by Ernie Malaga (Miami)

The case is supposed to be yellowish beige... the woodstock series was named after the small yellow bird in the Peanuts comic strip. The keys are a sort of off white/yellowish-grey. Over time (and often with the help of cancer stick smoke) the cases and keys do darken. I have lightened up some cases and evened out some color changes where the case was protected by a label by putting the case out in a nice Texas sun. I would not recommend this for the darker keyboard.


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