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  Description:  Toggle Blink/Intensity Bit      [PCjr] [EGA]
                                                [MCGA] [VGA]
 
  Determines whether the most significant bit of a character attribute
  will select blinking or intensified display.
 
  Input                                Output
  ═════════════════════════            ═══════
  AH=10H                               Nothing
  AL=03H
  BL=blink/intensity toggle
     0 =enable intensity
     1 =enable blinking
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