Task

Cause a line printer attached to the computer to print a line containing the message:    Hello World! 



Note

A line printer is not the same as standard output.

A   line printer   was an older-style printer which prints one line at a time to a continuous ream of paper.

With some systems, a line printer can be any device attached to an appropriate port (such as a parallel port).




HELLO    CSECT
         PRINT NOGEN
         BALR  12,0
         USING *,12
         OPEN  LNPRNTR
         LA    6,HW
         PUT   LNPRNTR
         CLOSE LNPRNTR
         EOJ
LNPRNTR  DTFPR DEVADDR=SYSLST,IOAREA1=L1
L1       DS    0CL133
HW       DC    C'Hello World!'
         END HELLO