DM15L Info - Make It Tea

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


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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''

==== 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]]



===== 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 |




===== 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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