A Dual Monitor Setup For The C64, And Yes, It's VGA Compatible | Hackaday
Commodore monitor to VGA or HDMI - Retrocomputing Stack Exchange
Commodore 64 128 C64 C64C Super Video AV Adapter - S-Video Composite & 2ch Audio | eBay
Amazon.com: StarTech.com Composite and S-Video to VGA Video Scan Converter - composite to VGA - scan Converter - s-Video to VGA (VID2VGATV2) , Black : Electronics