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Amiga 600 motherboard. There is not a lot of empty space in an A600. Stuff looks crammed before you start removing HDD cradle (removed here), Floppy Drive…
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The A600 motherboard revision info can be found bottom middle, just left of the trapdoor. This particular mobo is rev 1.5
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Seen here in the middle is the "Gayle" chip on an Amiga 600 motherboard. The chip handles bus control, floppy, PCMCIA, ATA interfaces etc.