The SuperMac E100 Extended Performance card is a combination high-speed SCSI connection and 100 Mbps Ethernet connection. Both connections require custom driver software support in order to function.
At the present time, the BeOS does not support this hardware. However, we'd be delighted to assist UMAX in the development of driver software for the BeOS. Be sure to let UMAX know that support for the BeOS is important to you as a customer!