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  Description:  Write Character at Cursor      [MDA] [CGA] [PCjr]
                                               [EGA] [MCGA] [VGA]
 
  Writes an ASCII character to the display at the current cursor position.
  The character receives the attribute of the previous character displayed
  at the same position.
 
  Input                                                           Output
  ════════════════════════════════════════════════════            ═══════
  AH=0AH                                                          Nothing
  AL=character
  BH=page
  BL=color (graphics modes, PCjr only)
  CX=count of characters to write (replication factor)
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