Does anyone know why the early revisions of the PlayStation had discrete composite jacks and the multi-AV port? Of course the discrete jacks were eventually dropped and never returned, but they make no sense existing in the first place.
The Sega Saturn had one multi port, and the 3DO had discrete outputs. I've never seen another system, or home video unit at all, with two sets of outputs in different forms for the same thing. The even earlier Japanese SCPH-1000 PlayStation had discrete s-video in addition to the multi-AV port. What was the possible purpose for this? Some kind of Japanese preference?
The only purpose I can imagine is to make it easier to connect older home audio setups of the day that were isolated from the video section. You could have the PlayStation connected to your amplifier and the TV at the same time and use either the TV's speakers or your amplifier.
The original SCPH-1000 in Japan even had discrete S-video in addition to the composite ports. Why?
From what I understand the multi-AV port also has a slightly different signal path than the discrete outputs for the audio.
Here's a photo of what I mean (bottom one). The early revision English instruction manuals of the era just ignore the issue completely by saying to use the included AV cables and ignore the multi-AV port completely.
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