If you're trying to connect that Genesis or N64, you probably need more than a simple cable.

This adapter is designed to turn a single USB connection into two additional HDMI outputs, giving you a total of three separate screens when you include your laptop display. It works with both USB-A ...

If you want a 'passable' gaming system that can handle virtually any current game at reasonable settings (not the highest), you can stick with the current laptop and run your main display via HDMI 2.1 ...

[Tomasz] tipped us about the well documented MIPI DSI Display Shield / HDMI Adapter he put on hackaday.io. The Display Serial Interface (DSI) is a high speed packet-based interface for delivering ...