Drive controller pics

I have several (3 actually) drive controllers that are in new cases with no
markings as to what controller they are. They pop up with Disk Extended
Color Basic 2.1 (or 2.0), and I don't know if they are FD500, FD501, or
FD502.

Does anyone have a link to the pictures of each of the drive controller
boards? I could compare them and judge which they really are.

Thanks

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