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Got some new boards in today which incorporate source termination resistors and a SN74HC367N buffer chip between each display... Was able to reliably drive 5 (I don't have the rest wired up to test yet) at 30MHz, but if I up the frequency any more the screens at the end of the chain start having issues (as opposed to the ones at the beginning). If I lessen the amount of screens I can increase the Hz more. So there's still something that's getting lost over the distance despite having repeaters every foot or so
How are you wiring between each buffer and display?