Wait, the first model of SNES has S-video? News to me.
About a year ago I bought a new AV cable for my SNES.
the cable the store had was a multipurpose one, for the GC/N64/SNES.
It was a combination Composite/S-video cable. Just to see if It would work, I tried the S-video. It works - but only in Black and white.
Maybe the n64 and cube s-video pins are slightly different from the SNES's...
(yes, it's a model 1; supposedly it was a store demo model. Also, the plastic has become discolored - something that doesn't happen with later model 1 SNESs, and not at all with the new SNES)
But as for the top-loading NES, I'm dissapointed; i would've swore it had AV. I was actually thinking about getting one, since both(!) of my front loaders are busted.