INT 10H 1015H: Read One DAC Color Register

                                                          Compatibility: VGA 
 Expects: AX    1015H
          BX    color register to read (0-255)
 Returns: CH    green value (00H-3fH)
          CL    blue value  (00H-3fH)
          DH    red value   (00H-3fH)
    Info: This obtains the current 18-bit RGB value of a specified DAC
          color register.

          See INT 10H 1010H for background info on 18-bit RGB values for
          DAC color registers.

   Notes: Use INT 10H 1017H to obtain the RGB values of a block of DAC

See Also: INT 10H 10H: EGA/VGA Palette Functions
          INT 10H: Video Services
          EGA/VGA Data Areas
          VGA I/O Ports