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To prevent critical connections from being plugged in the wrong
way, some pins have been clipped on the Hexpander, the 13-pin Jack
board, and the Acousti-Phonic. Corresponding holes are blocked on
the plug-in connectors so that they can only go together correctly.
In this diagram, the black squares indicate pins that are missing.
Missing Pins (keyed connections)
Acousti-phonic
Hexpander
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