 By default they were equipped with a Zilog Z-Net interface card, but a second Ethernet card could be added alongside to allow both network interfaces to be used simultaneously, however, the two network interfaces were not able to be bridged.Expansion cards could be added to standard 8-bit and 16-bit ISA sockets, which were both on the motherboard, and on an attached expansion board which was supplied as standard.RM released PCs based on Intel 286 and 386 processors under the RM Nimbus name.