Building a 24-bit arcade CRT display adapter from scratch
SMRTR summary
A Recurse Center member built a custom 24-bit USB display adapter to drive an arcade machine's CRT at 336x262 resolution after off-the-shelf solutions couldn't handle the non-standard resolution or provide better than 18-bit color depth. After multiple failed attempts with different microcontrollers due to USB bandwidth limitations and missing hardware features, they successfully created a board using an STM32H750 chip with external USB PHY that outputs true 24-bit VGA signals via USB high-speed, dramatically improving the arcade's visual quality.
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