A Dual Monitor Setup For The C64, And Yes, It's VGA Compatible | Hackaday
C64 S-Video cable – the easy way, and with no SCART | ilesj's blog
Syntiac pages - Turbo Chameleon 64
QUICK-BIT: Amiga Display VGA Adapter | 8-Bit Boyz
Amazon.com: eSynic RCA Composite AV S-Video to VGA Converter Box CCTV DVR PC Laptop to TV Projector VGA Input to VGA Output Video Converter Adapter : Electronics
Commodore 64 VIC20 Plus4 Over voltage EXTREME from CMD marketplace on Tindie