3037 is the Ethernet I Controller.
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It is part of an older (two card) Ethernet solution for ND-100 machines.
Switches and indicators
The A and B connectors are used for I/O, the C connector is used for the ND-100 Bus.
I/O Devices on the card
See the 3102 card.
Norsk Data Document ND–12.055.01 Ethernet II Controller