Am I the only one? 41-CX clock question

[Sylvain Cote]

(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.
Sylvain

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?
Juergen

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:

Code:

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

Sylvain