It is possible to disable the effect of the attribute characters on the CRT device, displaying them instead of executing them. This is useful when debugging OUTPUT. The DISPLAY FUNCTIONS ON statement causes all control characters to be displayed but not executed. The only exception is carriage return, CHR$(13), which is first displayed and then the print cursor is moved to column one of the next line. DISPLAY FUNCTIONS OFF returns execution of attribute characters to normal.
This function is the equivalent to pressing the DISPLAY FCTNS key or to executing the command, CONTROLCRT,4;State.
