DM41L Info - John's Vademecum

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====== DM41L Info ======
===== Purchase Information =====

  * Date   : 26 Aug 2024
  * From   : Swiss Micros (Direct)
  * Price  : approx £200
  * Serial : 05121
  * Battery Change : 26/08/24


===== Firmware =====



{{ :public:calculator:info:cp210x_universal_windows_driver.zip |}}


^Date^Serial No.^Firmware^Version^Firmware Files^Firmware Tool^
| 26/08/24| 05121 | DM41_32 | V32 |{{ :public:calculator:info:dm41_32.zip |}}|{{ :public:calculator:voyage_firmware_tool.zip |}}|
| 01/02/25 | 05121 | DM41_33 | V33 | {{ :public:calculator:info:dm41_33.zip |}} |  |
| 21/12/25 | 05121 | DM41_34 | V34 | {{ :public:calculator:info:dm41_34.zip |}} | Linux, using lpc21isp |

===== RTC =====

  * RTC is not capable of calibration/correction?
    * Perhaps the HP41CX Time corr. feature works?
    * Gather data on inherent time error for a period and then try to change the values via HP41CX functionality

==== Update January 2026 ====

^Date Start^Date Check^Delta^Latest Rate Error^Average Rate Error^Comments^
|23/01/26 |  |+49.6  |  |  | New Period Start |
|23/01/26|24/01/26 |+50.6 |+1.0 |+1.0 | After 24 hours |
|23/01/26|26/01/26|+52.8 |+1.2 |+1.1 | After 3 days |
|23/01/26|27/01/26 |+53.6 |+1.0 |+1.1 | After 4 days |

===== HP-41CX Owner's Manuals =====

Download from [[https://literature.hpcalc.org]]

  * HP-41CX Owner's Manual Vol. 1 : [[https://literature.hpcalc.org/community/hp41cx-om-vol1-en.pdf]]
  * HP-41CX Owner's Manual Vol. 2 : [[https://literature.hpcalc.org/community/hp41cx-om-vol2-en.pdf]]
  * HP-41CX Quick Reference Guide : [[https://literature.hpcalc.org/community/hp41cx-qrg-en.pdf]]

===== Further Information =====

  * [[public:calculator:progs:dm41l_progs|]]
  * [[..:bench2|]]

{{tag>calculator dm41l}}

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