The following control characters are read by the moniter at SAIL
and have the following effects:

↑C	Stop your job (it may be necessary to type this twice).
	You may continue your job by typing CONTINUE<return>.
rubout	Deletes last character typed (you may not delete past a
	return or line feed).
↑U	Deletes entire line
↑O	Suppresses output until TTY input is requested or another
	↑O is typed
↑I	Tab (to next multiple of 8 columns).
↑Z	End of file when treating TTY as input device.
↑P	Complements whether tabs are converted to spaces.
↑F	Complements whether lower case is converted to upper case
↑B	Complements duplexing (hit this if everything you type is
	echoed twice)
TTY FILL (at monitor level) puts extra characters after carriage
	return so that on 30 cps have enough time to execute return.