As ChainsawAsh pointed out, it's composite video (the single, yellow RCA plug - though it may not be yellow.) The few LD players that had component video were LD/DVD combi-players, but only the DVD unit utilized the component video (though some ingenious and resourceful folks have been able to modify this.)
"i just checked dvdit pe and there are 2 settings:
convert all audio to PCM"
Go ahead and stick with this setting. Without getting too technical, WAV and PCM are close cousins, and you'll get better fidelity (though it takes up more space.) Unless you have a program that allows you to adjust the Dolby Digital values, the resulting soundtrack usually doesn't sound as good. For regular home videos, this isn't much of a problem, but if you want a good copy of your SW LD's, then stick with PCM.