Make your own S-Video for your 8-bit card easily and quickly - Atari 8-Bit Computers - AtariAge Forums
http://atariage.com/forums/topic/286982-make-your-own-s-video-for-your-8-bit-card-easily-and-quickly
Heres how you can make your own top quality S-Video video board for almost any Atari 8 bit. It uses few parts and would take minutes to install.