Ok thanx guys so much!

That's it

It goes right below AV Multi Out port and to the motherboard i think....Does it make any sense ?

Hello everbody, my first post here. I've recently came across PS1 that has, i'd say, some "uncommon mod" (usb/serial 10 pin connector i think ?) so i suppose it could've been some dev kit thing. Model is SCPH-5502 PAL version I'd appreciate any help and info you could give me on this, than...