DM15L Info - Make It Tea

Try to learn something about everything, and everything about somethingThomas Huxley “Darwin's bulldog” (1824-1895)

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====== DM15L Info ======

{{ :public:calculator:dm15_1.jpg?&600 |}}

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===== Purchase Information =====

  * Date   : September 2021
  * From   : Swiss Micros (direct)
  * Price  : £95
  * Serial : 21350
  * New Battery
    * July 27<sup>th</sup> 2022
    * July 26<sup>th</sup> 2024
 
===== Firmware =====

==== Upgrade firmware on Linux ====

''sudo lpc21isp <firmware_file> /dev/ttyUSB0 115200 12000''


=== bash scripts ===

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'' 

<code bash>

#!/bin/bash
#

FWARE=LF15C_250408.hex

lpc21isp $FWARE /dev/ttyUSB0 115200 1200

</code>

''./dm32_flash.sh''

<code bash>

#!/bin/bash
#

FWARE=DM15_M1B_32.hex

lpc21isp $FWARE /dev/ttyUSB0 115200 1200

</code>

''./dm34_flash.sh''

<code bash>

#!/bin/bash
#

FWARE=DM15_M1B_34.hex

lpc21isp $FWARE /dev/ttyUSB0 115200 1200

</code>
==== Upgrade firware on Windows ====

=== Serial USB Driver for Windows ===

{{ :public:calculator:info:cp210x_universal_windows_driver.zip |}}

=== Windows Firmware Upload Tool ===

{{ :public:calculator:voyage_firmware_tool.zip |}}

==== Swiss Micros Official ====


=== Swiss Micros Firmware files ===

^Date^Serial No.^Firmware^Version^Firmware Files^Comments^
|24/05/22 |21350 |DM15_M1B |32 |{{ :public:calculator:dm15_m1b_32.zip |}}| Extended User Registers|
|22/11/23|21350|DM15|32| {{ :public:calculator:info:dm15_32.zip |}} | Standard User Registers |
|21/12/24 | 21350 | DM15_M1B | 33 | {{ :public:calculator:info:dm15_m1b_33.zip |}}| New 2-line stack and other mods |
|23/01/26 | 21350 | DM15_M1B | 34 | {{ :public:calculator:info:dm15_m1b_34.hex |}} | Bug fixes to new version | 

^ROM ^ Allocatable registers ^	RAM base addr. ^	Initial Memory Status^
|DM15 (Original ROM)| 64 |0xc0| 19 46 0-0|
|DM15_M80|128|0x80|19 110 0-0|
|DM15_M1B|229|0x1b|19 211 0-0|

==== LF15C - 3rd Party Firmware ====

  * From HP Forum [[https://www.hpmuseum.org/forum/thread-20046.html]]

For more details see [[LF15C]]

==== DESK-15 - 3rd Party Firmware ====

  * 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]]




===== RTC Error =====

  * 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

==== Update January 2026 ====

Using my [[..:..:miscellany:watches:watchcheck|python Watchcheck]]

^Date Start^Date Check^Delta^Latest Rate Error^Average Rate Error^Comments^
|23/01/26|  | -49.0 | |  | Delta -49.0. New firmware DM15 V34 loaded. New Period |
|23/01/26| 24/01/26| -47.0 |+2.1 | +2.1 | After 24 hours |
|23/01/26| 26/01/26 | -43.4 | +1.9 | +2.0 | After 3 days |
|23/01/26| 27/01/26 | -41.9 | +1.8 | +1.9 | After 4 days. LF15C loaded after time check |
|23/01/26| 11/02/26 | -11.2 | +2.0 | +2.0 | After 19 days. DM15_M1B_34 reloaded to check time |




===== Swiss Micros Info =====

  * Firmware      : [[https://technical.swissmicros.com/voyager/firmware/]]
  * Documentation : [[https://technical.swissmicros.com/voyager/doc/voyager_user_manual.html| Online HTML User Manual]]
  * Documentation : {{ :public:calculator:info:voyager_user_manual.pdf | PDF Manual}}
  * Product Page  : [[https://www.swissmicros.com/product/dm15l|DM15L]]


===== HP-15C Owner's Handbooks =====

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]]
===== DM15L Memory Dumps and Program Listings=====

  * See [[public:calculator:progs:dm15l_progs|]]




{{tag>calculator dm15l}}

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