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2026-09-05T22:32:24Z

Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex

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'''Documentation notice:''' This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

== Summary ==
Concise technical reference for the GPM2804. It covers the display, CM4 compatibility, setting up a Retropie image via an SD card, and key configuration steps (buttons, audio, fullscreen, filesystem, ROM updates). All facts are taken only from the provided source text.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20828 WSAL20828 – GPM280 Portable Game Console Based on Raspberry Pi Compute Module 4 Lite (Optional), WiFi]
* [https://shop.jw-tech.eu/p/WSAL20829 WSAL20829 – GPM280 Portable Game Console Based on Raspberry Pi Compute Module 4 Lite (Optional), WiFi]
* [https://shop.jw-tech.eu/p/WSAL20830 WSAL20830 – GPM280 Portable Game Console Based on Raspberry Pi Compute Module 4 Lite (Optional), WiFi]

== Technical overview ==
* The GPM2804 uses a 2.8-inch IPS display with a resolution of 640 x 480 pixels, a 70% NTSC color gamut, and a 60 fps refresh rate.
* The console is compatible with the Raspberry Pi Compute Module 4 series; the CM4 is listed as optional in the product metadata.
* A pre-configured Retropie v4.7 image is available; default login credentials are user “pi” and password “raspberry” (as written in the source).
* To install, format an SD card with SDFormatter, write the image using Win32DiskImager, insert the card into the console, and power on via the switch.
* For manual Retropie setup, place the ssh and wpa_supplicant.conf files in /boot and copy waveshare-4dpib-3b-4b.dtbo to /boot/overlays.
* Append the specified DPI, GPIO, and audio parameters to config.txt, and add the line “fbcon=rotate:3 video=DSI-1:480x640M@60,rotate=90” to cmdline.txt.
* Button mapping is done at the WELCOME screen by long-pressing A; unused buttons can be skipped.
* The IP address is shown via CONFIGURATION -> SHOW IP; SSH access with pi/raspberry allows editing autostart.sh, retroarch.cfg, and other files.

'''Commands and examples – verify before use:'''
<syntaxhighlight lang="text">
sudo nano /opt/retropie/configs/all/autostart.sh
emulationstation --screenrotate 3 --screensize 640 480
sudo nano /opt/retropie/configs/all/retroarch.cfg
</syntaxhighlight>

== Notes and version constraints ==
* Password is noted as “raspberry” in the source – verify against the actual configuration before use.
* The exact Retropie image version (v4.7) may be outdated; current versions should be confirmed separately.
* S1/S2/S3 switches control operating modes; incorrect settings can cause unintended behavior – verify switch positions before powering on.
* If battery charge is low (blinking red indicators or no indicator), the system will not start; charging requires a 5 V / 3 A adapter connected to the Micro USB port.
* Changes to config.txt, cmdline.txt, and DTBO files are version-sensitive; validate them against the specific Retropie release being used.

== Source and revision record ==
* [https://www.waveshare.com/wiki/GPM2804 GPM2804 - Waveshare Wiki]
* Source revision: 110995
* Captured: 2026-09-02T04:19:50+00:00
* SHA-256: <code>e15090e13c525d996f76d9b2f229bc7da68a4311aad083ce31ee4508976f610d</code>

WSAL20828 – GPM2804/en - Versionsgeschichte

JWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex