This is the schematic for the BIB printed circuit board.
In
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The DB9 connector on the upper left corner of the schematic is the input/output jack used to connect to accessories for data acquisition. The connector below that is the cable which connects to the printer port. A 5 pin DIN plug is also available for 0-6 volt DC input to the A/D converter. Ground and regulated 6v is brought out on the DIN for use off board.