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Table of Contents
DM41L Info
Purchase Information
- Date : 26 Aug 2024
- From : Swiss Micros (Direct)
- Price : approx £200
- Serial : 05121
- Battery Change : 26/08/24
Firmware
cp210x_universal_windows_driver.zip
| Date | Serial No. | Firmware | Version | Firmware Files | Firmware Tool |
|---|---|---|---|---|---|
| 26/08/24 | 05121 | DM41 | V32 | dm41_32.zip | voyage_firmware_tool.zip |
| 01/02/25 | 05121 | DM41 | V33 | dm41_33.zip | |
| 21/12/25 | 05121 | DM41 | V34 | dm41_34.zip | Linux, using lpc21isp |
RTC
- RTC is not capable of calibration/correction?
- Perhaps the HP41CX Time corr. feature works?
- Gather data on inherent time error for a period and then try to change the values via HP41CX functionality
Update January 2026
| Date Start | Date Check | Delta | Latest Rate Error | Average Rate Error | Comments |
|---|---|---|---|---|---|
| 23/01/26 | +49.6 | New Period Start | |||
| 23/01/26 | 24/01/26 | +50.6 | +1.0 | +1.0 | After 24 hours |
| 23/01/26 | 26/01/26 | +52.8 | +1.2 | +1.1 | After 3 days |
| 23/01/26 | 27/01/26 | +53.6 | +1.0 | +1.1 | After 4 days |
Swiss Micros Info
- Documentation : Online HTML User Manual
- Documentation : PDF Manual
- Product Page : DM41L
HP-41CX Owner's Manuals
Download from https://literature.hpcalc.org
- HP-41CX Owner's Manual Vol. 1 : https://literature.hpcalc.org/community/hp41cx-om-vol1-en.pdf
- HP-41CX Owner's Manual Vol. 2 : https://literature.hpcalc.org/community/hp41cx-om-vol2-en.pdf
- HP-41CX Quick Reference Guide : https://literature.hpcalc.org/community/hp41cx-qrg-en.pdf
