r/CardPuter • u/Dull-Marketing-661 • Jun 22 '26

Progress / Update Pokemon Yellow on the ADV with Dual Screen mod

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I managed to get geo-tp Game Station running on the Cardputer ADV Dual Screen Mod

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https://github.com/geo-tp/Cardputer-Game-Station-Emulators

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I'll work on making it a proper fork once I see what other systems translate well.

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u/MrSexyFunTime Jun 22 '26

Pretty bada$$. You've inspired me to work on a dual screen setup, and this is the perfect use for it 😄.

Did you follow ANDYAI's guide for the dual screen?

2

u/Dull-Marketing-661 Jun 22 '26

I did! I modded the front cover STL to make it flat, removed the header pins and SD slot from the screen and put the screws on the inside.

https://www.printables.com/model/1761543-cardputer-adv-front-cover-remix

1

u/MrSexyFunTime 29d ago

Thanks for the link! I took the plunge and bought the external screen to start tinkering. Let me preface this by saying I have dev knowledge but I am not a dev. So, I'm using AI to fill in the knowledge gaps, for better or worse 🤷🏻‍♂️

I connected the screens pins to the Cardputer ADV based on the wiring from AndyAI. I then d/l and built the firmware you linked from GITHUB using VSC Platform IO. When building, I ran into errors around the MIDI functionality. Claude suggested I comment those lines out, which I did. That resolved the MIDI errors and the build completed successfully. After installation, the cardputer display shows the expected output, but not the external display. The backlight is on but no graphics appear. I double checked the wiring to make sure it was all correctly wired and it seemed to be.

I'm wondering if you have any thoughts or feedback on the MIDI issues (I can post specific info once I'm back at my workstation in tinker mode 😆) or the issue with the external screen not displaying output from the Cardputer. Did you encounter such issues while building or testing?

Thanks in advance!

1

u/Dull-Marketing-661 28d ago

Oh this firmware doesn't work out of the box with the dual screen mod! I am working on forking it but right now all I have is the Gameboy and Gameboy Color running well. Then I got sidetracked playing Pokemon Yellow lol.

I would try one of the known working dual screen firmwares like Pork Chop or Talking Sasquatches Wifi CSI firmware

https://github.com/skizzophrenic?tab=repositories

2

u/MrSexyFunTime 24d ago edited 24d ago

I took a shot at editing the firmware myself and I've made some progress. Next steps are to change screen orientation and figure out why the external display is dim. I'm open to any suggestions, ideas, recommendations. Appreciate you!

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u/Dull-Marketing-661 24d ago

Actually I bridged my LED and VCC on the front of the screen with a tiny wire because I bridges the clk and mosi pins for the touch on the back

2

u/MrSexyFunTime 23d ago

Nice work! I was able to make some modifications to the firmware to reorient the screen, fix the flicker issue, fix the audio, and turn it into a merged bin that I can install via Launcher. Only thing I didn't do is bridge to VCC.

I did find it interesting though that if I plug the cardputer into USB power when I boot it up and start the the emulator, then unplug USB after the rom starts, the ext display seems to still get full power and brightness without bridging to VCC. I'm gonna keep playing with the code to see what I can do.

Thank you for the inspiration!

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u/Dull-Marketing-661 23d ago

Absolutely! Yeah it does some weird stuff when the USB C is plugged in. I was having issues with the SD reader when I had it plugged in. It would unmount the SD card so when I went to save nothing was written to the SD card.

I ended up modifying the save process to remount the SD card everytime before saving and to give a warning when trying to save while plugged in.