DM42 Info - Make It Tea

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====== DM42 Info ======

{{ :public:calculator:dm42_1.jpg?400 |}}

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===== Purchase Information =====

  * Date   : December 2020
  * From   : Swiss Micros (via Amazon)
  * Price  : £179
  * Serial : 06434
  * Battery Swap : 21/09/24


===== Firmware =====

^Date^Serial No.^DM42 Version^Free42 Version^DMCP Version^Firmware Files combined^DM42*.pgm^
|24/5/22 |06434 |3.21 |3.0.9 |3.22 |{{ :public:calculator:dmcp_flash_3.23_dm42-3.21.zip |}}| {{ :public:calculator:info:dm42-3.21.pgm |}}|
|15/4/23 |06434 |3.22 |3.0.15|3.24|{{ :public:calculator:info:dmcp_flash_3.24_dm42-3.22.bin |}}| {{ :public:calculator:info:dm42-3.22.pgm |}}|
| 27/07/24 | 06434 | 3.23 | 3.1.8 | 3.25 | {{ :public:calculator:info:dmcp_flash_3.25_dm42-3.23.zip |}} | {{ :public:calculator:info:dm42-3.23.pgm |}}|
| 11/02/26 | 0644 | 3.26 | 3.3.10 | 3.29 | {{ :public:calculator:info:dmcp_flash_3.29_dm42-3.26.zip |}} | {{ :public:calculator:info:dm42-3.26.pgm |}}|


=== 3rd party Firmware ===

  * DM42 restoration : {{ :public:calculator:info:dm42_pgm_qspi.zip |}}
    * DM42 pgm only (no QSPI) : {{ :public:calculator:info:dm42-3.23.zip |}}
  * Generally I find C47 to be sluggish and laggy and although the features are great the User Experience is poor.
    * The Dev. Team seem to spend more time adding new features/functions and don't really care that it's very slow
    * Reports indicate that the [[https://www.swissmicros.com/product/model-dm42n | DM42n]] runs C47 much faster

^Date^Serial No.^Firmware^Version^DMCP Version^Firmware Files^
| 21/09/24 | 06434 | C47 | 0.109.02.05 | 3.25 | {{ :public:calculator:info:c47_010824_release.zip | C47 Release : 1 August 2024 }} |
| 18/02/25 | 06434 | C47 | 0.109.02.07b4 | 3.25 | {{ :public:calculator:info:c47-dmcp-00.109.02.07b4.zip | C47 Release : 2 Jan 2025 }} |

===== RTC Correction =====

  * approx. error +3.4s/d = +39.3pm
  * Correction factor C from ''C = 2^20 P /(10^6 + P)''
  * Approximations : 
    * ''C = 1.04858 P''
    * ''P = 0.953674 C''
  * Calculated ''C = -41.26''

Put a text file ''/rtccalib.cfg'' in root directory of FAT drive with contents:
<code>
-41.26
</code>

==== 2022 ====


^Start^Stop^Accumulated Error (s)^Rate Error (s/d)^Comments^
|28/3/22 |7/11/22 |-5.8|0.0 | -5.8s over period 224 days = -0.03s/d |

==== Update January 2026 ====

Using my [[..:..:miscellany:watches:watchcheck|python Watchcheck]]

^Date Start^Date Check^Delta^Latest Rate Error^Average Rate Error^Comments^
|26/01/26|  | -43.0 |  |  | Start Period. Correction -39.1ppm |
|26/01/26|27/01/26| -43.2 | -0.3 | -0.3 | After 24 hours |
|26/01/26|04/02/26| -42.8 | +0.1 | +0.0 | After 9 days |



===== Swiss Micros Info =====

  * Firmware      : [[https://technical.swissmicros.com/dm42/firmware/]]
  * Documentation : [[https://technical.swissmicros.com/dm42/doc/dm42_user_manual.html|Online HTML User Manual]]
  * Documentation : {{ :public:calculator:info:dm42_user_manual.pdf | PDF Manual}}
  * Product Page  : [[https://www.swissmicros.com/product/dm42|DM42]]


===== HP-42S Owner's Manuals =====

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

  * HP-42S Owners's Manual : [[https://literature.hpcalc.org/community/hp42s-om-en.pdf]]
  * HP-42S Programming Examples & Techniques : [[https://literature.hpcalc.org/community/hp42s-prog-en.pdf]]

===== DM42 Program Listings =====

  * See [[public:calculator:progs:dm42_progs|]]



{{tag>calculator dm42}}

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