S-video is better than RCA cables in terms of video quality, but due to the sheer crappiness that is TV resolution, the only possible way I have ever been able to get 'somewhat' readable text out of my tv was to change the resolution to 640x480.
But even then, it's still blurry. You'd need a HD TV to get clearer text.
I only used my TV as a second monitor for watching movies or using emulators. (Nothing like playing The Legend Of Zelda A Link To The Past on an actual TV using a REAL SNES controller on your pc, kekeke)
heh, 386 posts for me, funny since I i've got a 386 processor lying around here somewhere..