<-[[.:]] ====== DM41X Info ====== {{ :public:calculator:dm41_1.jpg?400 |}} {{ :public:calculator:dm41_2.jpg?400 |}} {{ :public:calculator:dm41_3.jpg?400 |}} {{ :public:calculator:2022-05-24_23.23.38.jpg?400 |}} ===== Purchase Information ===== * Date : February 2022 * From : Swiss Micros (Direct) * Price : £185 * Serial : 01266 * Battery Swap * 22/9/22 * 11/02/25 ===== Firmware ===== ^Date^Serial No.^DM41X Version^DMCP Version^Firmware Files^ |24/05/22 |01266| 2.1 | 3.20 |{{ :public:calculator:dmcp_flash_3.20_dm41x-2.1.zip |}}| |27/07/24| 01266| 2.2 | 3.25 | {{ :public:calculator:info:dmcp_flash_3.25_dm41x-2.2.zip |}} | ===== RTC Correction ===== * approx. error +3.5s/d = +40.5ppm * Correction factor C from ''C = 2^20 P /(10^6 + P)'' * Approximations : * ''C = 1.04858 P'' * ''P = 0.953674 C'' * Calculated ''C = -42.47'' Put a text file ''/rtccalib.cfg'' in root directory of FAT drive with contents: -42.47 ==== update 28/5/22 ==== After a period of observation the rate is now over-corrected. Try reducing correction to ''-37.5'' which corresponds to a ppm error of ''35.76ppm'', or ''3.26 s/d''. ==== RTC Error ==== ^Start^Stop^Accumulated Error (s)^Rate Error (s/d)^Comments^ |28/3/22 |24/5/22 | |-0.1 |correction applied (C=40). Uncorrected error +3.5| |24/5/22| | | |new correction C=-42.47 | |24/5/22|25/5/22| |-0.3 |new correction in wrong direction? | |28/5/22| | |-0.3|still over-corrected. New factor: -37.5. DM41X reports this is a correction of -35.3ppm | |28/5/22|31/5/22 | |+0.2 | Now under-corrected? Difference across 3 days is only 0.5 seconds, so perhaps needs longer to reduce reaction-time-error| |28/5/22 |28/6/22 | | +0.1 | Almost 1 month later. Delta 31/5/22 = -15.7s, Delta 28/6/22 = -11.6s. +4.1s in 28 days | |28/5/22| 8/7/22| | +0.1 | Delta -10.1s | |28/5/22 | 21/9/22 | | + 0.2 | Delta +1.2s. Still slightly under-corrected but good enough | |28/5/22 | 15/4/23| -7.6 | +0.0 | Delta -7.6s in 322 days = 0.02 s/d | |15/04/23 | 22/11/23 | +33.3 | +0.2 | | ===== Notes ===== ==== Complex Numbers ==== I'm using the ''41Z complex number'' module by Angel Martin to add a 4-level complex number stack. It's a bit confusing at first to get to grips with, but adds a lot of functionality to the the DM41x. After a bit of trial and error (this is my first play with a "plug-in module" after all) I discovered the simplest way to make the keyboard function normally, and get easy access when needed to the complex functions, was to assign a USER key (usually the statistics summation key ''∑+'' to the 41Z module function ''∑ZL''. Each press of ''∑+'' now temporarily modifies all the keys to access specific 41Z functions. The functions available are extensive, through the use of the SHIFT key and by multiple presses of the ''∑+'' (henceforth referred to as ''Z'') key. I drew out a diagram to show the various functions available. {{ :public:calculator:2022-02-18_23.03.17.jpg?400 |}} Once a selection is made the keyboard switches back to its normal behaviour, so all the usual functionality is available. Most of these are unlikely to be used often - and it's also possible to make a much narrow selection of 41Z functions and make your own ''USER'' assignments, rather than use the ''∑ZL'' keyboard - although this might mean you block access to inbuilt functions you might want - which would mean switching out of USER keyboard mode at times. At the moment the ''∑ZL'' option seems the most versatile. Many of the 41Z functions available are beyond my pay grade and unlikely to ever find a use, but the Complex Keyboard still makes things much easier to deal with. For example the two keypresses: Z 1\x is much easier than the 7 it would otherwise need to invert a complex number XEQALPHAZINVALPHA I need to practice finding the right function (the main ones printed on the keyboard as well as the new ones provided by 41Z's ''∑ZL'' keyboard, but my fingers are slowly starting to move in the right direction. One thing I do notice, though, as that due to the need to press various keys (''XEQ, ALPHA, SHIFT'' etc) it's sometimes possible to make a real mess if you miss a vital key in the middle of entering lots of data & instructions and find your stack totally screwed up, or several lines of program code full of nonsense.... I'm sure it'll all become second nature soon enough. /* {{:public:calculator:2022-02-18_23.42.07.jpg?300 |}} {{:public:calculator:2022-02-18_23.41.20.jpg?300 |}} */ {{:public:calculator:2022-02-18_23.42.07.jpg?300 |}} {{:public:calculator:2022-02-18_23.41.20.jpg?300 |}} ---- ==== HP16C Emulator module ==== This is another interesting module to add the functionality of the HP16C - the **Programmer's Calculator** designed to handle calculations in various mathematical bases as used in computer programming and networking : Binary, Octal, Hexadecimal and Decimal. I adds much more value than the rather basic functions in the //Advantage Pac// module. After much trial and error I found a combination of HP16C module and //Library 4// library that worked correctly. The ''HP16C'' module //needs// the ''Library 4'' module, but I found some problems with different versions. Using the versions contained in the //Swiss Micros// package had a weird bug - the **16* ** (multiplication) function simply didn't work. I found a post by Angel Martin on the HP Calculator Forum with a ZIP file containing the 2 modules that //**worked**// correctly. Here is the zip file : {{ :public:calculator:hp-16c_rev.1a.zip}} I'll make a separate guide to using the main features here [[public:calculator:guides:hp16c_emulator|]] ===== Guides ===== [[public:calculator:guides:start|]] ===== Swiss Micros Info ===== * Firmware : [[https://technical.swissmicros.com/dm41x/firmware/]] * Documentation : [[https://technical.swissmicros.com/dm41x/doc/dm41x_user_manual.html|User Manual]] * Product Page : [[https://www.swissmicros.com/product/dm41x|DM41X]] ===== Issues ===== * Arrived new with a speck of dirt behind the glass in front of the LCD. * Able to remove by carefully prising the glass from its bezel (it's held in with double-sided tape) ====41Z Deluxe Module ==== ++++ Weird behaviour with its "common factor" display | * A number such as ''10 + j 1'' //displays// as ''10(1 + j)'' which is **wrong** * example: * ''( 5 + j 10 ) + ( 45 - j 5 ) '' is really ''( 50 + j 5)'' * calculator displays ''50(1 + j)'' * the actual numbers in the registers are correct (50 for Real in X and 5 for imaginary in Y) but the answer displayed as ''50( 1 + j )'' is badly misleading. * doing further calculations with the number on the stack is correct, as long as the answer doesn't have the same display-factorisation bug to mislead you. The only way to be sure is to look at the underlying X and Y stack registers. This spoils the nice ''ALPHA'' display of complex numbers, though. * it appears whenever the real and imaginary numbers are related by factors of 10 (e.g. 5 and 50, 2 and 20, 3 and 3000, 25 and 250) * __My__ Solution is to abandon the ''deluxe'' module and revert to a previous version, __not deluxe__ : ''HP41Z Complex Number Module'' version ''4L'' and the appropriate ''library4'' module. * This module seems to handle the ''common factor'' display correctly. * it **does not** show ''50 + j 5'' as ''50( 1 + j )'' * it **does** show ''50 + j 50 '' as ''50( 1 + j )'' * It requires a different ''USER KEY'' assignment: SHIFT ASNALPHAZKBRDALPHA'Σ+' === Module files that work (for me) === * {{ :public:calculator:info:41z.mod |}} * {{ :public:calculator:info:library4.mod |}} * See [[public:calculator:guides:41z_module|]] ++++ === Update September 2024 === The factorization error in the ''deluxe'' version has been fixed by Angel.... [[https://forum.swissmicros.com/viewtopic.php?f=26&t=4029 | Swiss Micros forum discussion about the issue ]] * the fixed version {{ :public:calculator:info:41z_bs_2x2_2_.zip |}} * My page [[public:calculator:guides:41z_module|]] ===== DM41X Program Listings ===== * See [[public:calculator:progs:dm41x_progs|]] Page Updated : ~~LASTMOD~~ {{tag>calculator dm41x}}