ex —
Excelan 10 Mb/s Ethernet interface
ex0 at uba0 csr 164000 vector excdint
NOTE: This driver has not been ported from 4.4BSD yet.
The ex interface provides access to a 10
    Mb/s Ethernet network through an Excelan controller used as a link-layer
    interface.
Each of the host's network addresses is specified at boot time
    with an SIOCSIFADDR
    ioctl(2). The
    ex interface employs the address resolution protocol
    described in arp(4) to
    dynamically map between Internet and Ethernet addresses on the local
    network.
  - ex%d: HW %c.%c, NX %c.%c, hardware address %s.
- This provides firmware revisions levels, and is expected during
      autoconfiguration.
- ex%d: can't initialize.
- There was a failure in allocating UNIBUS resources for the device.
- ex%d: configuration failed; cc = %x.
- The hardware indicated an error when trying to initialize itself. The
      error code returned is described at length in the device Reference
    Manual.
- ex%d: receive error %b.
- The hardware indicated an error in reading a packet from the cable.
      Specific Error bits are provided
- ex%d: transmit error %b.
- The hardware indicated an error in transmitting a packet to the cable or
      an illegally sized packet. Specific Error bits are provided
- ex%d: can't handle af%d.
- The interface was handed a message with addresses formatted in an
      unsuitable address family; the packet was dropped.
Theex driver appeared in
  4.3BSD.