I don't know if they are NOS (new old stock) or not, in the fact I just buy one will take a while to arrieve.

But FYI, I decided to buy a brand new PS1 just because this project! So I hope you guys don't let me down.

What's the real differences between 7001 & 7501 ?!

This looks just like a daughterboard, I guess is a DB.

No service manual?

This one says is "original":
http://www.ebay.com/itm/1PC-NEW-ORIGINA ... 2a2060f852