Male RGB21 to 4 BNC + Audio Cable Sony PVM Sega SNES Neo Geo Japanese SCART 3FT | eBay
3A Company RGB 21 Pin to HDMI Adapter Retro Converter HD SFC/PS/SS Support | eBay
RGB15ピン(2段)→RGB21ピンRGBケーブル | クラシックPC研究会
RGB21-HDMI Adapter | Japan Trend Shop
Comparing the old generation game with the composite output using the "RGB 21 - HDMI conversion adapter" in which the analog video becomes clear with the HDMI output - GIGAZINE
RGB21-HDMI Adapter | Japan Trend Shop
RGB21-HDMI Adapter | Japan Trend Shop
Adapter released that allows SNES, PS1 systems and more to run in HDMI - Japan Today
Female RGB21 to 4 BNC + Audio Cable Sony PVM Sega SNES Neo Geo Japanese SCART | eBay