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THESE PHOTOS SHOW HOW THE SCANNER BOARD WITH THE STOP TERMINALS PLUGS INTO THE MIDI CONVERTER BOARD. THE SCANNER BOARD CAN BE FLIPPED OVER TO STACK ONTO THE MIDI BOARD AFTER THE STOPS WIRING CONNECTIONS HAVE BEEN MADE.

You may connect 
to Allen Organ MOS Stop
Array Interface
or direct to stops

FOR ALLEN MOS ORGANS THE REFERENCE IS SHIFTED TO 5 VDC AND LEVEL TRANSLATING TRANSISTOS ARE PROVIDED AT THE MIDI OUTPUT(S).