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SJ Research A300 Nexus Interface (top)
This is an Issue 5 Nexus interface for 300 Series card with an Cumana Nexus ATM Networking STD Card version 2.23 ROM.
SJ Research A300 Nexus Interface (back)
SJ Research A300 Nexus Interface (bottom)
This SJ Research A300 nexus interface appears to be one sold be Cumana with a Nexus ATM Networking ROM.
I have no documentation for Nexus ATM Networking.