Well, HDMI has lots of issues but at least it is reasonably standard. We do have one now very old rear projection system that is 1080i with just component inputs, so how do you connect the Playstation to it. Got an el cheapo Gigaware cable that support component to Xbox, Playstation or just about anything else, but it shows a wierd artifact. I get floating bands of purple scrolling through. So what to get that really works.
As UltimateAVMag.com explains, Sony has a proprietary connection called Multi AV output and there is a optical Toslink which only outputs Dolby Digital and DTS (not the newer Dolby True HD or DTS-HD Master Audio).