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Am I the only one? 41-CX clock question
10-12-2016, 10:05 PM (This post was last modified: 10-12-2016 10:19 PM by Sylvain Cote.)
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RE: Am I the only one? 41-CX clock question
(10-12-2016 08:08 PM)JurgenRo Wrote:  
(10-12-2016 03:37 PM)Sylvain Cote Wrote:  The HP-82182A Time module and the HP-41CX contains a crystal (or RC circuit?) that keep time and need the batteries to keep the clock working.
Each time you remove the batteries or remove the time module for a C/CV, the clock stop and time is lost.
Hi Sylvain,
checked it a minute ago on my HP-41CX Halfnut, S/N > 2700. XEQed "TIME", removed batteries, inserted batteries, XEQed "TIME" again. On my machine, the clock did not stop. Is your machine a Halfnut or a Fullnut?

Hello Juergen,

You were right to challenge my memory.
I took 8 x HP-41 from my collection, representing the different models, put a time module in each C/CV/CL and then I did the following test ...
  • 20.0000 SETTIME // set time to 8 PM
  • TIME // to check if the time was correctly configured
  • OFF
  • remove battery holder, wait for timer (1, 2, 3, 4 & 5 minutes) expiration then put back the battery holder
  • TIME // check if the time was kept or lost

Test results:
Model          ROM      Serial#     Time kept  
-------------  -------  ----------  -----------
HP-41C  FN/TK  GFF      2046A03187   3  minutes 
HP-41C  FN     GFF      2101A05170   5+ minutes 
HP-41C  HN     HFF      2411S42991   2  minutes 
HP-41CV FN     HFF      2407A40051   3  minutes 
HP-41CV HN     HFF      2552S20514   3  minutes 
HP-41CX FN     NFL/DCC  2521S41245   4  minutes 
HP-41CX HN     NFL/DCC  2814S20780   3  minutes 
   41CL FN     V3                   10  seconds
Acronyms: FN=Fullnut / HN=Halfnut / TK=Tallkeys

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RE: Am I the only one? 41-CX clock question - Sylvain Cote - 10-12-2016 10:05 PM

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