Bart on Twitter: "Did anyone already build an RGB scart cable for the Ultimate 64? I found the following pinout, but it's not clear where to connect the composite sync to on
Commodore 64 S-Video, Composite, and SCART cables - how to build your own on the cheap - YouTube
Commodore C64 / C128 / Vic 20 / C16 / Plus 4 to Scart TV Cable, AmigaStore.com - Worldwide store for Commodore Amiga hardware and software