Socket 370 inside an amiga....?

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yes, this is simply one of the SingleBoardComputers. There are dozens of them on ebay if you search. They just take power from the ISA bus. While physically inside the Amiga, it's a stand alone PC which doesn't share any resources. You can even put a Pentium 4 inside your Amiga this way.

[countzero]

here is the P4 one. there is also link to downloadable user manual.