The practicality of the project isn't really the point; it's mostly a fascinating demo of hardware hacking skill.
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Okay, it won't play real cartridges, the sound is kind of jank, and the performance isn't always full speed. Still, this is quite an achievement for a few reasons. The PaperS3 is an e-Ink dev kit, not really a commercial product. It's intended for prototyping and, well, exactly this sort of hardware hacking. A key detail to understand is that this device isn't powered by some multi-core Rockchip or Allwinner SoC, but rather by an ultra-low-cost ESP32-S3 microcontroller with just two cores running at clock rates measured in hundreds of MHz, not GHz. Moreover, its e-Ink display is not really intended for the kind of smooth refresh normally required for playing video games, yet Zhang pulled it off.
To understand how this Game Boy emulator is even possible, you have to understand Zhang's breakthrough with E-ink hardware, which he originally developed for his open-source monitor project, the Modos Flow . He has a whole video explaining the tech, but the summary is basically that he replaced the display controller of a typical e-Ink display with a powerful FPGA so that he could treat every single pixel as an independent display region and then only update the parts of the screen that are actually changing each frame.
How, then, did he achieve this on the embedded controller in the PaperS3? It's only possible because the Game Boy screen is very low resolution by modern standards at just 160×144 pixels. The screen on the PaperS3 is 960×540, so he was able to multiply the resolution by three to give him enough room for dithering to reproduce the four possible shades of the original Game Boy screen. This process takes up almost the entirety of the second CPU core in the ESP32, leaving just enough room for audio processing while the actual emulation happens on the first CPU core.
Watch On The end result is a very convincing facsimile of the Game Boy's display, except instead of being a tiny and dim LCD, it's a razor-sharp, crystal-clear e-Ink display . Zhang even implemented some quality-of-life features, such as partial Bluetooth LE controller support as well as dedicated quick-save and quick-load touchscreen 'buttons' to save the emulator's state. You can even load a state directly from the front-end, allowing you to instantly resume where you left off when you have to stop.
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Reference reading
- https://www.tomshardware.com/video-games/retro-gaming/SPONSORED_LINK_URL
- https://www.tomshardware.com/video-games/retro-gaming/designer-turns-niche-e-ink-dev-board-into-a-60hz-game-boy-handheld-960×540-display-powered-by-ultra-low-cost-esp32-s3-microcontroller#main
- https://www.tomshardware.com/subscription
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