es —
Ethernet driver for SMC91C90-based Ethernet boards
The es interface provides access to a 10 Mb/s Ethernet
  network via the SMC91C90 Ethernet chip set.
Each of the host's network addresses is specified at boot time
    with an SIOCSIFADDR
    ioctl(2). The
    es interface employs the address resolution protocol
    described in arp(4) to
    dynamically map between Internet and Ethernet addresses on the local
    network.
The es interface supports the following Zorro II
  expansion cards:
  - EthernetPLUS
- CEI A4066 EthernetPLUS Ethernet card, manufacturer 1053,
      product 10
 
The es interface first appeared in
  NetBSD 1.1.