Use your vintage PC with a VGA monitor. You could then connect to a VGA to HDMI + HDMI to USB

adapter to capture vintage game play on a modern PC.

This is the ready assembled board with a pre-flashed Pi Pico 2 included. 

My version of the PCB uses more generic 5v to 3.3v level shifter boards. I have some 10cm extension cables

if the board overlaps with other used ports on your laptop.

Provide 5v power to the Pi Pico. 

UK Postage £1.50. Happy to post worldwide for £9.99.