11/3/71 SYS 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 passed in r0. First, the system
delays until the typewriter is quiescent. Then,
the argument dcrsr is placed into the typewri-
ter's receiver control and status register, and
dcpsr is placed in the printer control and status
register. The DC-11 manual must be consulted for
the format of these words. For the purpose of
this call, the most important rôle of these argu-
ments is to adjust to the speed of the type-
writer.
The mode argument contains several bits which de-
termine the system's treatment of the typewriter:
200 even (M37 tty) parity allowed
100 odd (non-M37 tty) allowed
040 raw mode: wake up on all characters
020 map CR into LF; echo LF or CR as CR-LF
010 don't echo (half duplex)
004 map upper case to lower 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 imme-
diately to the program. No erase or kill pro-
cessing is done; the end-of-file character (EOT),
the interrupt character (DELETE) and the quit
character (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 Ter-
miNet 300's).
FILES --
SEE ALSO gtty
DIAGNOSTICS The error bit (c-bit) is set if the file descrip-
tor does not refer to a typewriter.
BUGS This call should be used with care. It is all
too easy to turn off your typewriter.
OWNER ken, dmr