I recently bought a nice 41C which serial number begins with 2043A.
The machine has a halfnut display. As far as I can see on hpmuseum pages, early machines had a fullnut display. Though I assume this is an early model, I know little about this issue.
Can someone let me know if halfnuts were already marketed on the 2nd year of Hp41 production in the states ?
Question about HP-41C Serial #
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11-08-2005, 04:01 PM
11-08-2005, 04:10 PM
No, they (half-nuts) did not appear until 1985 or so. What you have is a unit that was returned for repair late in the game, after they stopped fullnut support so HP service just stuck the old back on a new front half of a replacement calculator. It would be interesting to know if it truly has only 46 free registers or if it is really a CV with a C label on it.
11-08-2005, 04:50 PM
46 reg free.
11-08-2005, 05:21 PM
Hmm. So either they made some halfnut 41Cs specifically for replacements like this, or else they hacked a 41CV to make it act like a 41C. And what HP hacketh, perhaps ..
11-08-2005, 05:52 PM
I believe Wlodek's guide to HP's says that HP made a very small number of halfnut 41c calculators for replacements. They are quite hard to find and worth $$ to collectors who truly want one of everything.
11-08-2005, 06:26 PM
Sorry, forgot to add that since a CV defaults to 46 free, you've got to do an [xeq] [alpha] [size] [alpha] [000] to know for sure. Chances are it is a HP hacked C version of a halfnut CV. Several have been reported here and yes, the gold ball contacts are consistent with an early C case back. Consider yourself lucky, it still remains the only 41 variant I do not own along with many other 41 collectors, marble blue and clear cases non-withstanding.
11-09-2005, 11:20 AM
Thank you all for these informations. |
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