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--- public:calculator:info:dm42_info [24/04/23 17:24 BST] – created john
+++ public:calculator:info:dm42_info [06/03/25 06:49 GMT] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
-<-[[.:start]]
+<-[[.:]]
+====== DM42 Info ======
+<WRAP col2>
-====== Dm42 Info ======
+{{ :public:calculator:dm42_1.jpg?400 |}}
-** Description **
+{{ :public:calculator:dm42_2.jpg?400 |}}
-===== Section One =====
+{{ :public:calculator:dm42_3.jpg?400 |}}
+{{ :public:calculator:2022-05-24_23.23.16.jpg?400 |}}
-===== Section Two =====
+</WRAP>
+===== Purchase Information =====
---- //John Pumford-Green 24/04/23 16:24//
+  * Date   : December 2020
+  * From   : Swiss Micros (via Amazon)
+  * Price  : £179
+  * Serial : 06434
+  * Battery Swap : 21/09/24
-===== Further Information =====
+===== 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 |}} |
-{{tag>}}
+=== 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}}