Amazon.com: Kaico SEGA Saturn 1080p HDMI Adapter - for use with Sega Saturn - Supports S Video Output – Supports PAL and NTSC Consoles – Aspect Ratio Switch for 16:9 or 4:3 : Video Games
Amazon.com: Kaico SEGA Genesis & Saturn 2X Line Doubler HDMI Adapter - for use with Sega Saturn, Megadrive, Genesis, SNK Neo Geo - Supports RGB and Composite Output - All in One
Sega Saturn HD RAD2X 480p cable
Thefoo.83 Sega Saturn SCART cable review – VideoGamePerfection.com