Automatic data stream language determination for printer

A PRINTER (1) MONITORS THE CURRENT CONTROL LANGUAGE THAT IS BEING INTERPRETED FOR END OF PAGE AND END OF TASK CODES DEPENDING ON THE LANGUAGE. AFTER OBSERVATION OF SUCH COMMANDS, UP TO 500 BYTES ARE OBSERVED IN THE INTERMEDIATE MEMORY (19) TO OBSERVE THE CHARACTERISTICS OF THE COMMAND CODES OF SPECIFIC LANGUAGES. THE ASCII LANGUAGE IS RECOGNIZED BY ANY OF THE DIFFERENT COMMAND CODES, MANY OF WHICH HAVE THE ESC CHARACTER. THE POSTSCRIPT LANGUAGE IS RECOGNIZED BY ANY OF ITS DIFFERENT COMMANDS THAT INCLUDES THE ASCII SEQUENCE OF THE SIGN OF MUCH PERCENT. THE PCL4 OR PCL5 LANGUAGES AND WRITING DEVICE GRAPHIC LANGUAGES OF THE WRITING DEVICE MAY ALSO BE RECOGNIZED. WHEN A CHARACTERISTIC OF THE CODES OF A SPECIFIC LANGUAGE IS RECOGNIZED THE PRINTER IS ADJUSTED TO INTERPRET THAT LANGUAGE. IN THIS WAY THE OPERATOR'S INTERVENTION AND THE SPECIAL CODING THAT DEFINES EACH LANGUAGE ARE AVOIDED.