Siemens IC35 Modernization

Giving a Siemens IC35 organizer a new life

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I have an old Siemens IC35 organizer that didn't get any use back in its day but it is a nice little device that deserves another chance.

In upgrading the IC35 I see two main aspects to be addressed, processing and the display. To be useful I think it makes most sense to put in a Raspberry Pi Zero, since I don't want to spend a lot of time getting the Z80 to work and there's a bit of space in the case. I would like to reuse the display but am also considering putting in one of those ubiquitous 3.5" touch screen displays for higher resolution (and color).

In addition to the processing and screen the following will also need to be addressed:

  • Keyboard; it's probably best to design a custom PCB for the keyboard in order to make efficient use of the space inside.
  • Battery management; can possibly be integrated into the keyboard PCB

Other features I would like to implement are

  • Put a SD card slot in place of a MMC slot
  • Make use of the old serial port in some way
  • Put in an IR transceiver where the old one was

  • Display

    Stefan Lochbrunner06/22/2022 at 20:03 0 comments

    Currently I'm undecided between trying to reuse the old display and replacing it with a 3.5" (touch screen) display. I'm having trouble finding information on the old LCD and is only monochrome with a resolution of 240 by 160. On the one hand I want to reuse the old components but on the other a new display would be easier to use with the Raspberry Pi, have higher resolution and color. Therefore, I'm leaning a bit towards a new display.

    If you have some information on the old LCD or know a good resource to find more details, please let me know.

  • Resources

    Stefan Lochbrunner06/22/2022 at 19:21 0 comments

    Some (possibly) useful links I found so far

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Florian wrote 06/22/2022 at 22:58 point

About the display, "T6C24" and "T6C23" both returned a result on it is a ROW DRIVER LSI FOR DOT MATRIX DISPLAY and a COLUMN DRIVER LSI FOR A DOT MATRIX LCD made by Toshiba.

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Stefan Lochbrunner wrote 06/23/2022 at 07:52 point

Thanks for pointing that out! I had searched for information on the chip in the center and the whole assembly, figuring that T6C23 and T6C24 would be just arbitrary designations like "PORT301" on the right.

But to be honest, getting this display to work seems like its whole own project. 

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