[Coco] PAL Chip?

[C.W.]

I have several large chips left over from modifying Coco 3s and MPIs. 

 

How do I  know if one of them is the PAL chip? I've had someone ask for one
if I had it, but so far, I cannot figure out what chips are what. I have
figured out the 3 small chips I pulled out of the Coco 3 when I upgraded it
to 512k.

 

Thanks