SJ Research RiscPC Nexus Card (Bottom)
SJ Research RiscPC Nexus Card (back)
SJ Research RiscPC Nexus card (top)
Although this card looks like an Ethernet NIC, it is not, it is a Nexus card as can be seen from the word "NEXUS" on the top of the card (see bottom picture). It cannot be used except in a Nexus network and I doubt if there are many of them around today!
This card looks like a later SJ Research product because it uses an RJ45 connector instead of the mini-DIN connector used in earlier cards. The ROM Is RISCPC 2.22.