The Atari computers (except the 400) had S-video from the very beginning, and the JVC-made Commodore 1702 is a great match for them because it has separate luma & chroma inputs.

Interestingly, LaserDisc players, the best consumer video medium until the late '90s, mostly didn't have S-video outputs because the luma & chroma signals were mixed on the disc; providing a separate output for each wouldn't have gained you anything.