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CBL_WRITE_SCR_N_CHATTR Details (↑ Screen Routines)
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  Parameters on Entry:
 
     screen-position         The screen position at which to start writing.
                             The top left corner is row 0, column 0.
                             See ◄Notes on screen routines►.
 
     character               The character to write.
 
     attribute               The attribute to write.
 
     string-length           The number of screen positions to write
                             the character-attribute pair to. If this
                             would go off the end of the screen, the
                             write finishes at the end of the screen.
 
  Parameters on Exit:
 
     None
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