DM15L Info

• Date : September 2021
• From : Swiss Micros (direct)
• Price : £95
• Serial : 21350
• New Battery
  • July 27^th 2022
  • July 26^th 2024

sudo lpc21isp <firmware_file> /dev/ttyUSB0 115200 12000

just to reduce the typing…. still need to press the hidden reset button to start the flashing and to start the new firmware.

You can have separate scripts for ease of loading different firmware

./lf_flash.sh

#!/bin/bash
#
 
FWARE=LF15C_250408.hex
 
lpc21isp $FWARE /dev/ttyUSB0 115200 1200

./dm32_flash.sh

#!/bin/bash
#
 
FWARE=DM15_M1B_32.hex
 
lpc21isp $FWARE /dev/ttyUSB0 115200 1200

./dm34_flash.sh

#!/bin/bash
#
 
FWARE=DM15_M1B_34.hex
 
lpc21isp $FWARE /dev/ttyUSB0 115200 1200

cp210x_universal_windows_driver.zip

voyage_firmware_tool.zip

• From HP Forum https://www.hpmuseum.org/forum/thread-20046.html

For more details see LF15C - firmware for the DM15

• From HP Forum https://www.hpmuseum.org/forum/thread-23488.html
• You Tube https://youtu.be/ktrKZzN3wJw
• Github for firmware and brief README guide https://github.com/zooxo/desk15

I'll try it out and write up some details…..

Desk15 - firmware for the DM15

• RTC is not capable of calibration/correction
• RTC appears to continue running even when switching firmware
  • LF15C has no ability to display RTC but it the rate appears unaffected by the firmware changes
  • Requires that Swiss Micros firmware is loaded in order to check current RTC time

Using my python Watchcheck

• Firmware : https://technical.swissmicros.com/voyager/firmware/
• Documentation : Online HTML User Manual
• Documentation : PDF Manual
• Product Page : DM15L

Download from https://literature.hpcalc.org/

• HP-15C Owner's Handbook : https://literature.hpcalc.org/community/hp15c-oh-en.pdf
• HP-15C Advanced Functions Handbook : https://literature.hpcalc.org/community/hp15c-afh-en.pdf

• See DM15L Progs