intro —
introduction to special files and hardware support
This section describes the special files, related driver functions, and
  networking support available in the system. In this part of the manual, the
  SYNOPSIS section of each configurable device gives a sample specification for
  use in constructing a system description for the
  config(1) program. The
  DIAGNOSTICS section lists messages which may appear on the console and/or in
  the system error log /var/log/messages due to errors
  in device operation; see
  syslogd(8) for more
  information.
This section contains both devices which may be configured into
    the system and network related information. The networking support is
    introduced in
    netintro(4).
This section describes the hardware supported by
  NetBSD/cobalt. Software support for these devices
  comes in two forms. A hardware device may be supported with a character or
  block device driver, or it may be used within the networking
  subsystem and have a network interface driver. Block and
  character devices are accessed through files in the file system of a special
  type; see mknod(8). Network
  interfaces are indirectly accessed through the interprocess communication
  facilities provided by the system; see
  socket(2).
A hardware device is identified to the system at configuration
    time and the appropriate device or network interface driver is then compiled
    into the system. When the resultant system is booted, the autoconfiguration
    facilities in the system probe for the device and, if found, enable the
    software support for it. If a device does not respond at autoconfiguration
    time it is not accessible at any time afterwards. To enable a device which
    did not autoconfigure, the system must be rebooted.
The autoconfiguration system is described in
    autoconf(4). A list of
    the supported devices is given below.
The following systems are supported:
The devices listed below are supported in this incarnation of the system.
  Devices are indicated by their functional interface. Not all supported devices
  are listed.
  - gt
- PCI bridge
- com
- serial communications interface
 
PCI devices are supported through the
    pci(4) bus and associated
    device drivers.
This cobalt intro appeared in NetBSD
  2.0.