Trailing-Edge
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PDP-10 Archives
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decus_20tap4_198111
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decus/20-0125/lpoff.for
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SUBROUTINE LPOFF
C***********************************************************
C
C THIS ROUTINE IS USED TO DISABLE THE LIGHT PEN.
C
C POSSIBLE ERRORS:
C ?INVALID REPLY TO LPOFF COMMAND
C
C WARNING:
C IF THE LIGHT PEN IS DISABLED, THE SUBROUTINE LPHIT
C WILL ALWAYS RETURN WITH THE ERROR:
C %LIGHT PEN NOT ENABLED
C
C ROUTINES CALLED:
C SEND - SENDS A COMMAND TO THE GT40
C GET - RECEIVES A STATUS TRANSMISSION FROM THE GT40
C ERROR - ERROR LOGGING ROUTINE
C
C***********************************************************
IMPLICIT INTEGER (A - Z)
100 CALL SEND(6, 0, 0, 0)
CALL GET(STATUS, X, Y, DNUM)
IF(STATUS .EQ. "66) GO TO 100
IF(STATUS .EQ. 0) RETURN
CALL ERROR('?INVALID REPLY TO LPOFF, STATUS =',STATUS)
RETURN
END