Then working VGA capture card working with BIOS take me lot of time and 5200USD... I think it's more cheap with ESP32 just grab 1Bit for each color, reduce to 1FPS, and send frame by frame to serial. After it's just simple software displaying raw image.

Hi,
I don't understand why it crash, even in emulator.
Even in setup() loop. I use arduino IDE, it's not support debug mode.
I always code into C/C++, and I don't see anything wrong.
Few bit help please. Code is working when I rewrite for Linux.
Regards,

Oups, I forgot the 60FPS... just 1FPS it's well for me.
All the VGA capture card I tested into market is not able to capture BIOS (500USD to import here, then I search cheap solution)... and when OS is loaded I have other way to capture.

Hi, I wish just merge RGB signals (via resistor), and have something like:
0-253 -> grey scale
254 -> HSync
255 -> VSync
Send the stream to USB
Read the stream via VLC or similar.
It's just for BIOS and maximum resolution 800x600.
Allow me to debug boot, not need VGA screen, capture to publish on ...