<-[[.:]] ====== DM42 Info ====== {{ :public:calculator:dm42_1.jpg?400 |}} {{ :public:calculator:dm42_2.jpg?400 |}} {{ :public:calculator:dm42_3.jpg?400 |}} {{ :public:calculator:2022-05-24_23.23.16.jpg?400 |}} ===== 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 |}} | | 11/02/26 | 0644 | 3.26 | 3.3.10 | 3.29 | {{ :public:calculator:info:dmcp_flash_3.29_dm42-3.26.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: -41.26 ==== 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 | ===== 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}}