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dc(7)


NAME

  dc - serial line/mouse/keyboard


SYNOPSIS

  controller   dc0   at ibus0	slot 0	 vector dcintr


DESCRIPTION

  The dc serial line controller provides DECstation 2100, DECstation 3100,
  DECstation 5000, and DECstation 5100 computer systems with keyboard, mouse,
  and serial communications interfaces. The serial communications interfaces
  on the DECstation 2100 and DECstation 3100 provide partial modem control.
  The serial communications interfaces on the DECstation 5000 provide full
  modem control. The device special file /dev/tty01 on a DECstation 5100
  provides full modem control, while the remaining ports provide no modem
  control at all. All serial communications interfaces operate at baud rates
  from B50 to B9600, excluding B200.

  The dc ports are used as follows:

  Port	  Usage

  0	  Graphics device keyboard at 4800 BPS

  1	  Mouse or tablet at 4800 BPS

  2	  Communications port 1 (w/modem control)/local terminal

  3	  Communications port 2 (w/modem control)/local terminal

  On all systems except the DECstation 5100, serial port 2 is used for the
  system console port in server (that is, non-graphics) configurations.	 On
  DECstation 5100s, the serial port labeled 3 on the back of the system is
  always the system console port.  The serial system console port always
  operates at 9600 BPS, 8-bits, no parity; modem control is not supported.


RESTRICTIONS

  Data communications equipment attached to the console serial port in server
  configurations must be set to 9600 BPS, 8-bits, no parity. The scc driver
  enforces this restriction.


FILES

  /dev/console
      console terminal

  /dev/tty00
      local terminal

  /dev/tty01
      local terminal

  /dev/tty02
      local terminal (DECstation 5100 only)


SEE ALSO

  console(7), devio(7), tty(7), MAKEDEV(8)

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