mc —
Ethernet driver for Am79C940 (MACE) onboard Ethernet
The mc interface provides access to a 10 Mb/s Ethernet
  network via the AMD Am79C940 (MACE) Ethernet chip set.
The mc interface supports the on-board Ethernet of the
  following mac68k machines:
  - Centris 660AV
- Quadra 660AV
- Quadra 840AV
The mc interface supports the on-board
    Ethernet of the following macppc machines:
  - Apple Network Server (500 and 700)
- Apple Power Macintosh (7200, 7300, 7500, 7600, 8500, 8600, 9500, and
    9600)
- Power Computing (PowerCenter, PowerCenter Pro, PowerCurve, PowerTower,
      PowerTower Pro, and PowerWave)
  - mc0 at obio0: address %s.
- This is a normal autoconfiguration message noting the 6 byte physical
      Ethernet address of the adapter.
Themc interface first appeared in
  NetBSD 1.3.