V9990 video card with external 15 kHz RGB output and onboard S-VIDEO output
https://github.com/cristianoag/trh9000?fbclid=IwAR0E4UVhJMtglAqKlprZGAH8rGdd2J11TJh2_lI3ONT9s0jWOy_5myZCdPk
https://theretrohacker.com/product/trh9000-for-msx-the-open-source-yamaha-v9990-video-card/