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Unix Version 7 - man page for getty (v7 section 8)

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GETTY(8)										 GETTY(8)

       getty  - set typewriter mode

       /etc/getty [ char ]

       Getty  is invoked by init(8) immediately after a typewriter is opened following a dial-up.
       It reads the user's login name and calls login(1) with the name as argument.  While  read-
       ing  the  name  getty attempts to adapt the system to the speed and type of terminal being

       Init calls getty with a single character argument taken from the ttys(5)  file  entry  for
       the terminal line.  This argument determines a sequence of line speeds through which getty
       cycles, and also the `login:' greeting message, which can contain character  sequences  to
       put various kinds of terminals in useful states.

       The  user's  name is terminated by a new-line or carriage-return character.  In the second
       case CRMOD mode is set (see ioctl(2)).

       The name is scanned to see if it contains any lower-case alphabetic  characters;  if  not,
       and  if	the  name is nonempty, the system is told to map any future upper-case characters
       into the corresponding lower-case characters.

       If the terminal's `break' key is depressed, getty cycles to the next speed appropriate  to
       the type of line and prints the greeting message again.

       Finally, login is called with the user's name as argument.

       The following arguments from the ttys file are understood.

       0      Cycles  through  300-1200-150-110  baud.	 Useful  as  a	default  for dialup lines
	      accessed by a variety of terminals.

       -      Intended for an on-line Teletype model 33, for example an operator's console.

       1      Optimized for a 150-baud Teletype model 37.

       2      Intended for an on-line 9600-baud terminal, for example the Textronix 4104.

       3      Starts at 1200 baud, cycles to 300 and back.  Useful with 212 datasets  where  most
	      terminals run at 1200 speed.

       5      Same as `3' but starts at 300.

       4      Useful for on-line console DECwriter (LA36).

       init(8), login(1), ioctl(2), ttys(5)

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