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HP Forum Archive 09

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Re: HP-41 bat holder
Message #1 Posted by db(martinez,california) on 11 Dec 2002, 11:34 p.m.

if that is the double extended memory module that s.o.s. made and educalc sold then you will need a cx or an extended functions mod on your c.

can you really switch an extended memory module fast enough to not loose data?

Re: HP-41 bat holder
Message #2 Posted by Vieira, Luiz C. (Brazil) on 12 Dec 2002, 12:43 a.m.,
in response to message #1 by db(martinez,california)


the worst is not to switch the X-mem modules. If you have two 41C or CV, you must switch the X-Functions, too. And keep the same port position. I know because I have already tried this maneuver.

If you have a CX, you MUST have the first X-Mem's 124 registers completely filled with one or more files, and none of this files should have any bytes beyond the 124 first X-Mem registers. I cannot say you should keep the same information on both basic 124 registers of each X-Functions, but I'll try this configuration later and post results. If, by any reason, one single byte is left OR loose beyond the first 124 extended registers, all remaining information in the X-Mem Module is lost. This means the very first byte of the first X-Mem to be switched must be the very first byte of the first file IN THIS X-Mem module. I also tried this maneuver with success.

Anyway, as 'db' mentioned (Hi, db!), there is no way to get any information from or to any X-Mem module in an HP41C/CV (even an Educalc double) without an X-Functions module. I am not sure HEPAX, or CCD, or HPPC or any other "not regular" HP41 module will have this functionality.


bat holder
Message #3 Posted by Michel Beaulieu on 12 Dec 2002, 11:56 a.m.,
in response to message #2 by Vieira, Luiz C. (Brazil)

Thanks, i tried it and nothing to do with that module in a C. What about the batt holder? where to find one???

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