Help to identify modchip with photos

I got a fat PS2 and opened it up to clean it of dust and found this hidden in a piece of duct tape, I dont want to mess with trying to get the tape off in case I break a wire Im hoping someone knows what it is from the wire solder locations and the amount of wires if not what would this mod be doing? is it a play burnt games mod or a region free mod? When it boots up it looks no different to a normal boot screen. I cant get the pictures to work with this site so here is a link instead:

http://s836.photobucket.com/user/sierragames/library/PS2 Modchip
 
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