sys-stty(2) - Unix First Edition Manual Page
11/3/71SYS_STTY (II)

NAME stty -- set mode of typewriter
SYNOPSIS (file descriptor in r0)sys stty; arg / stty = 31.; not in assembler


arg: dcrsr; dcpsr; mode
DESCRIPTION stty sets mode bits for a typewriter whose file descriptor is passedin r0. First, the system delays until the typewriter is quiescent.


Then, the argument dcrsr is placed into the typewriter's readercontrol and status register, and dcpsr is placed in the printer control and status register. The DC--11 manual must be consulted forthe format of these words. For the purpose of this call, the most important role of these arguments is to adjust to the speed of thetypewriter.


The mode arguments contains several bits which determine the system'streatment of the typewriter:


200 even (M37 tty) parity allowed100 odd (non--M37 tty) allowed 040 raw mode: wake up on all characters020 map CR into LF; echo LF or CR as CR--LF 010 don't echo (half duplex)004 map upper case to lower case on input (M33 TTY)


Characters with the wrong parity, as determined by bits 200 and 100,are ignored.


In raw mode, every character is passed back immediately to theprogram. No erase or kill processing is done; the end--of--file character (EOT), the interrupt character (DELETE) and the quitcharacter (FS) are not treated specially.


Mode 020 causes input carriage returns to be turned into new--lines;input of either CR or LF causes CR--LF both to be echoed (used for GE TermiNet 300's).
FILES
SEE_ALSO gtty
DIAGNOSTICS The error bit (c--bit) is set if the file descriptor does not referto a typewriter.


BUGS This call should be used with care. It is all too easy to turn offyour typewriter.
OWNER ken, dmr