This is the front of the M885 point plot display D/A board. It is used with the M869 ( 85K) point plot display control board to drive X/Y monitors like the VR14 monitor.
All the round adjustment pots on the board are to trim the D/A conversion so it can draw a straight line without jumps. The gray and blue ones in the upper right adjust board internal +-5V reference supplies.
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