public:calculator:info:dm42_info
Table of Contents
DM42 Info
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 | dmcp_flash_3.23_dm42-3.21.zip |
| 15/4/23 | 06434 | 3.22 | 3.0.15 | 3.24 | dm42_3.24.zip |
| 27/07/24 | 06434 | 3.23 | 3.1.8 | 3.25 | dmcp_flash_3.25_dm42-3.23.zip |
3rd party Firmware
- DM42 restoration : dm42_pgm_qspi.zip
- DM42 pgm only (no QSPI) : 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 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 | C47 Release : 1 August 2024 |
| 18/02/25 | 06434 | C47 | 0.109.02.07b4 | 3.25 | 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 PP = 0.953674 C
- Calculated
C = -41.26
Put a text file /rtccalib.cfg in root directory of FAT drive with contents:
-41.26
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
- Documentation : User Manual
- Product Page : DM42
DM42 Program Listings
- See DM42 Progs
public/calculator/info/dm42_info.txt · Last modified: 06/03/25 06:49 GMT by 127.0.0.1