Cloning PCB could be done, but what are you going to do about chips that are now in unobtanium? And who's going to program all those GAL's, even if you manage to buy some old stock?

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Lattice is still selling the GAL chips. And they have a development system available on their site for free with which to create the logic/program files.

However, you are correct in spirit. The tough part would be figuring out exactly what logic equations are implemented by the GALs.

However, once that is known, making duplicates of the chips does not present any substantial challenges. There are at least a couple of members on the list with programmers which can write to GALs.

But, again, 68030 chips are expensive if bought new and hard to find used.