DM42 Info - John's Vademecum

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<-[[.:]]
====== DM42 Info ======

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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^
|24/5/22 |06434 |3.21 |3.0.9 |3.22 |{{ :public:calculator:dmcp_flash_3.23_dm42-3.21.zip |}}|
|15/4/23 |06434 |3.22 |3.0.15|3.24|{{ :public:calculator:dm42_3.24.zip |}}|
| 27/07/24 | 06434 | 3.23 | 3.1.8 | 3.25 | {{ :public:calculator:info:dmcp_flash_3.25_dm42-3.23.zip |}} |

=== 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>

==== RTC Error ====

^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 |



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

  * Firmware      : [[https://technical.swissmicros.com/dm42/firmware/]]
  * Documentation : [[https://technical.swissmicros.com/dm42/doc/dm42_user_manual.html|User Manual]]
  * Product Page  : [[https://www.swissmicros.com/product/dm42|DM42]]



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

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



{{tag>DM42 calculator}}

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