AT&T 6300 Programmer's Manual page 319

Syntax
screentype
Remarks
LeOPY
Command
Dumps the screen text to the line printer.
LCOPY [ screentype ]
is an integer expression representing the type of screen
in use
If the parameter "screentype" is not given, or
has the value 0, the text screen is printed on
the current system printer.
If "screentype" is greater than 0, and an INT 5
handler (for dumping the screen) is installed,
INT 5 is executed. Interrupt 5 is a program for
printing the screen bitmap on a graphics
printer.
If "screentype" is greater than 0, and an INT 5
handler is NOT installed, the message "Illegal
function call" is displayed.
7·1h~