As that webpage said, the only logic boards that will run in a Colour Classic without modification are the LC/Performa 520, LC/Performa 550/Colour Classic II, and LC/Performa 575 logic boards. If you can, I'd go with an LC575 board, simply because its the most powerful, most expandable with both LC PDS AND Comm slots, as well as the ability to hold more VRAM than the others (1MB vs 768k), and upgradable to PowerPC too

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