Asynchronous Terminals and Printer Processes Programming Manual

PROCEDURE CALLS FOR ACCESSING TERMINALS
SETPARAM
CALL SETPARAM ( file-number , operation [, parameter-array ]
[, parameter-count ] [, last-parameter-array ]
[, last-parameter-count ] )
file-number
The number of the file as an integer value.
operation
3
parameter-array
A list of parameters from the following:
0 = equivalent to parameter 1 of SETMODE 11
1 = equivalent to parameter 2 of SETMODE 11
2 = the most significant word of the break tag
3 = the least significant word of the break tag
parameter-count
This value must be 8. If it does not equal 8, it is
rejected with error 21 (ILLEGAL COUNT SPECIFIED).
last-parameter-array
Previous parameter settings.
last-parameter-count
The length of last parameter array in bytes--always 8.
When the I/O process detects a BREAK from a terminal, it sends a
message to the owner of BREAK for that terminal. The owner reads
a buffer from $RECEIVE. The message contains the following:
• -20 (identifies this as a break message)
• Logical device number of the terminal for TERMPROCESS or of
the LIU for ATP6100
3-6