Re: trying to turn on the PS1 for the nostalgia
Component cables were compatible with the PS2 and PS3 only, so your only real options are Composite, UHF, or maybe S-Video (I forget if the PS1 supported S-Video, or not. The PS2 and PS3 did though...)
Though, if you're going to be playing PSX games on a flatscreen, you'd be better off using a PS2/PS3 over HDMI, as you'll get the best image quality for it. (Also, there are HDMI adapters for PS2 you can find on Ebay and such...)
But if you don't care about visual clarity and the like, then by all means.
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