Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
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Int 21h Function 09h
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     The string must be terminated with the character $ (24h), which is
     not transmitted. Any other ASCII codes, including control codes,
     can be embedded in the string.
 
     See Int 21h Functions 02h and 06h for single-character output to
     the video display or standard output device.
 
     If CTRL+C is detected at the keyboard, an Int 23h is executed.
 
     You can also send strings to the display by performing a write
     (Int 21h Function 40h) using either the predefined handle for the
     standard output (0001h) if it has not been redirected or a handle
     obtained by opening the logical device CON.
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