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JurgenRo · 10-13-2016, 06:41 PM

(10-12-2016 10:05 PM)Sylvain Cote Wrote:
(10-12-2016 08:08 PM)JurgenRo Wrote: 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

Hi Sylvain,
thank you for the comprehensive Analysis. And, yes, I agree! My HP-41CX does not hold time-information for a longer period than just a few minutes either (if at all). But it does hold the Information long enough for changing batteries without a hurry, though. Thank you again for the investigtion and sharing the results!
All the Best,
Jürgen