| DMC(4) | Device Drivers Manual (vax) | DMC(4) | 
dmc —
dmc0 at uba0 csr 167600
The dmc interface provides access to a
    point-to-point communications device which runs at either 1 Mb/s or 56 Kb/s.
    DMC-11s communicate using the DEC DDCMP link layer protocol.
The dmc interface driver also supports a
    DEC DMR-11 providing point-to-point communication running at data rates from
    2.4 Kb/s to 1 Mb/s. DMR-11s are a more recent design and thus are preferred
    over DMC-11s. The NXMT and
    NRCV constants in the driver may be increased in
    this case, as the DMR can accept up to 64 transmit and receive buffers, as
    opposed to 7 for the DMC.
The configuration flags specify how to set up the device,
| 0 | full duplex DDCMP (normal mode) | 
| 1 | DDCMP Maintenance mode (generally useless) | 
| 2 | DDCMP Half Duplex, primary station | 
| 3 | DDCMP Half Duplex, secondary station | 
SIOCSIFADDR
  ioctl(2), and the destination
  address specified with a SIOCSIFDSTADDR
  ioctl(2), before the interface
  will transmit or receive any packets.
SIOCSIFDSTADDR
  ioctl(2). To use the DMC as a
  link between local nets, the route to the remote net must be added manually
  with the route(8) command, or
  by the use of the routing process
  routed(8) on each end of the
  link.
dmc driver appeared in
  4.2BSD.
| February 17, 2017 | NetBSD 10.1 |