HP 41CX math and X memory problems

11242018, 09:32 PM
(This post was last modified: 11242018 09:42 PM by Jlouis.)
Post: #1




HP 41CX math and X memory problems
Hi all,
I have a 41CX with math, IR printer, Advantage and X memory modules. The prolems are the the calculator do no find the math and X memory modules. In cat 2, it does not show these both modules. In cat 4, there's a DIR EMPTY message. The math module is ok in my CV. I can not test the X memory due I don't have the X functions module. When I press Prgm, there are 218 REG, after a reset in the calculator. I have tried different positions, with and without others modules. Am I missing something here or I have a defective calculator or X memory module? Edit: I don't know if it mathers, but the CX is a halfnut one. Any enlightenment is highly appreciated. TIA JL 

11242018, 10:01 PM
Post: #2




RE: HP 41CX math and X memory problems
(11242018 09:32 PM)Jlouis Wrote: Hi all, The XMemory module is never seen in CAT 2. An Xmem module simply adds more extended RAM for the builtin Extended Functions to manage (the CX has the Ext Functions/Memory module builtin). CAT4 returns the amount of XMemory available to the X register. Try this with and then without the XMem module inserted and you should see different results. If they are the same then either the module or the slot you are using is bad. Try other slots. If the Math ROM is not seen in any of the slots, the module is probably bad. The fact that the printer and Adv ROM work confirms those slots are good  try rotating ports and see if there is a pattern. For both modules, if they have been sitting for a long period, especially not inside a 41C, it's possible oxidation has builtup on the contacts, just like any other device. Try CAREFULLY cleaning the contacts with DeOxit RED (I use Qtips with much of the cotton pulledoff before starting). It's also possible the 'bad' ports inside need to be cleaned, but do so carefully here as well  the blade you push the module onto is sturdy, but the leads on the folded connector sheet can be torn if they are badly oxidizing. Bob Prosperi 

11242018, 10:44 PM
Post: #3




RE: HP 41CX math and X memory problems
(11242018 10:01 PM)rprosperi Wrote: The XMemory module is never seen in CAT 2. An Xmem module simply adds more extended RAM for the builtin Extended Functions to manage (the CX has the Ext Functions/Memory module builtin). Thanks for the reply Bob. The X memory is working good, I did further read in the manual showed that we need to press the arrow key for the available x memory. As for the math module, I will do the cleaning you suggested. This is only for curiosity, as I have the marh/stat Pac and really don't need another math. Thanks again. Cheers JL 

11252018, 01:27 AM
Post: #4




RE: HP 41CX math and X memory problems
(11242018 10:44 PM)Jlouis Wrote: This is only for curiosity, as I have the marh/stat Pac and really don't need another math. HP initially released the two modules separately 0004115002 Statistics Pac (4K FOCAL module using pluginport lower page) 0004115003 Mathematics Pac (4K FOCAL module using pluginport lower page) then later on they rereleased it as a combined module 0004115049 Math/Stat Pac (4K FOCAL Math module using pluginport lower page and 4K FOCAL Stat module using pluginport upper page) 

11252018, 02:56 AM
Post: #5




RE: HP 41CX math and X memory problems
(11252018 01:27 AM)Sylvain Cote Wrote:(11242018 10:44 PM)Jlouis Wrote: This is only for curiosity, as I have the marh/stat Pac and really don't need another math. Thanks Sylvain, I noticed that the Math/Stat came with both manuals separetely, so I understood they are the same combined and you confirmed that. Now I have to say, I'm in love with my 41CX! My 15C is already jealous 

11252018, 07:48 AM
Post: #6




RE: HP 41CX math and X memory problems
(11242018 10:44 PM)Jlouis Wrote: I did further read in the manual showed that we need to press the arrow key for the available x memory. or you can do EMROOM http://WilsonMinesCo.com (Lots of HP41 links at the bottom of the links page, http://wilsonminesco.com/links.html ) 

11252018, 08:43 PM
Post: #7




RE: HP 41CX math and X memory problems
(11252018 02:56 AM)Jlouis Wrote: Now I have to say, I'm in love with my 41CX! My 15C is already jealous :) :) You finally saw the light! Enjoy. ;) Greetings, Massimo +×÷ ↔ left is right and right is wrong 

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