Locking The Program Mode 69 Press the Scroll mode is locked, you cannot use the operator panel to change the configuration settings. However, you can still select the configuration menus and view the current configuration settings. Press more...
IBM 6400 Model 010 Matrix Printer - User Guide (page #69)
DIRECTION BIDIRECTIONAL* Move into the PRINT DIRECTION menu. The asterisk (*) shows that this is printer to the NOT READY mode. 13. OPERATORMENU LOCKED Locks Program mode and the OperatorMenu. more...
IBM 6400 Model 010 Matrix Printer - User Guide (page #83)