Sega Dreamcast to HDMI Converter Supports 16:9/4:3 switching, Plug and Play HD HDMI Cable for Sega Dreamcast (Sega DC)
Azduou
XHSESA Practical SD Card Reader Adapter with CD for Sega Dreamcast Dreamshell V4.0 Game Machine Accessories
XHSESA
LevelHike HDMI Cable for Sega Dreamcast DC Console, Dreamcast to HDMI Adapter with True VGA Signal Output (100% Improved Video Quality-HD Converter)
LevelHike
RetroScaler SEGA Dreamcast Wireless Controller Adapter - Supports SEGA Dreamcast Game Console, Compatible with PS3/PS4/PS5, Xbox One S, Series X/S, Switch Pro Bluetooth Controllers
BITFUNX