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INT 10h,  10h (16)       Set Palette Registers                      PCjr, EGA

    Sets the palette registers on the PS/2.

       On entry:      AH         10h
                      AL         Subservice
                                 0 - Set palette register
                                     BL      Palette register
                                     BH      Value to set

                                 1 - Set overscan (border) color register
                                     BH      Value to set

                                 2 - Set palette registers and border register
                                     ES:DX   Pointer to color list

                                 3 - Toggle intensify/blinking bit
                                     BL      0 - Enable intensify
                                     BL      1 - Enable blinking

                                 7 - Read Palette Register (VGA)
                                     BL      Palette register number
                                     Returns:
                                     BH      Palette register contents

                                 8 - Read Border Color Register (VGA)
                                     Returns:
                                     BH      Border Color

                                 9 - Read All Palette Registers (VGA)
                                     ES:DX   Address of a 17-byte table
                                     Returns:
                                     Contents of all 16 palette registers
                                       and border color

                                10h - Update DAC Register (MCGA, VGA)
                                     BX      Color register number
                                     DH      Red color value
                                     CH      Green color value
                                     CL      Blue color value

                               12h - Update DAC Block (MCGA, VGA)
                                     ES:DX   Address of DAC Block
                                     BX      Number of first DAC to update
                                     CX      Number of DACs to update

                               13h - Set DAC Color Paging (VGA)
                                     BH      Color page to use
                                     BL      1 . Use 64 DAC pages
                                             0 . Use 16 DAC pages

                               15h - Read DAC Register (MCGA, VGA)
                                     BX      Color register number
                                     Returns:
                                     DH      Red color value
                                     CH      Green color value
                                     CL      Blue color value

                               17h - Read Block of DAC Registers (MCGA, VGA)
                                     ES:DX   Address of data buffer
                                     BX      Number of first DAC to read
                                     CX      Number of DACs to read
                                     Returns:
                                     Fills buffer

                               1Ah - Get DAC Paging Status (VGA)
                                     Returns:
                                     BH      Color page in use
                                     BL      1 . Using 64 DAC pages
                                             0 . Using 16 DAC pages

                               1Bh - Convert DACs to Grey (MCGA, VGA)
                                     BX      First DAC to convert to grey
                                     CX      Number of DACs to convert

       Registers destroyed:      AX, SP, BP, SI, DI

  --------------------------------------------------------------------------

    There are 16 palette registers on the EGA and PCjr displays and 1
    overscan (border) register. This service gives the user control over
    these registers. The four subservices are explained below.

  Subservice 0 (Set Palette Register)

    Each of the 16 palette registers can take on 1 of 64 values. the value
    in BH is formatted as follows:

          Bit 7 - Reserved
          Bit 6 - Reserved
          Bit 5 - Secondary Red
          Bit 4 - Secondary Green
          Bit 3 - Secondary Blue
          Bit 2 - Red
          Bit 1 - Green
          Bit 0 - Blue

    The secondary colors have an intensity of 1/3, while the normal colors
    have an intensity of 2/3. For example, BH = 02h will produce green, BH
    = 10h will produce a dim green, and BH = 12h will produce a bright
    green.

    The default values for the palette registers, which are the same as
    the Color Graphics Adapter (CGA), are defined below:

  --------------------------------------------------------------------------
                   Palette
                   Register        Color value         Color
                     00h               00h             Black
                     01h               01h             Blue
                     02h               02h             Green
                     03h               03h             Cyan
                     04h               04h             Red
                     05h               05h             Magenta
                     06h               14h             Brown
                     07h               07h             White
                     08h               38h             Dark Gray
                     09h               39h             Light Blue
                     0Ah               3Ah             Light Green
                     0Bh               3Bh             LIght Cyan
                     0Ch               3Ch             Light Red
                     0Dh               3Dh             Light Magenta
                     0Eh               3Eh             Yellow
                     0Fh               3Fh             Bright White
  --------------------------------------------------------------------------

  Subservice 1 (Set Overscan (Border) Register)

    This subservice sets the border color. The Enhanced Color Display
    supports overscan in 200-line modes only.

  Subservice 2 (Set All Palette Registers and Overscan Register)

    ES:DX points to a 17-byte color list, in which the first 16 bytes
    consist of new values for the 16 palette registers and the last byte
    is the new overscan register value.

  Subservice 3 (Toggle intensify/blinking bit)

    Normally bit 7 of the attribute byte is used to indicate foreground
    blinking. With this subservice, bit 7 can indicate foreground blinking
    (BL=1) or background intensity (BL=0).

  Subservice 7 (Read Palette Register (VGA))

    This subservice reads the color value in a palette register. Place the
    number of the register to read in BL. The color value in that register is
    returned in BH.

  Subservice 8 (Read Border Color Register (VGA))

    This service returns the color value of the current border in BH.

  Subservice 9 (Read All Palette Registers (VGA))

    You can read all palette registers, and the border color, at the same
    time with subservice 9. Pass the address of a 17-byte data buffer in
    ES:DX. INT 10h fills the buffer with the contents of the 16 palette
    registers and the border color.

  Subservice 10h (Update DAC Register (MCGA, VGA))

    This subservice lets you update an individual DAC register. To use it,
    place the number of the DAC register in BX, the new 6-bit red value in
    DH, the 6-bit green value in CH, and the 6-bit blue value in CL.

  Subservice 12h (Update DAC Block (MCGA, VGA))

    You can also update a whole block of DACs. You have to set up a table of
    RGB values (red, green, blue, red, green, blue...) corresponding to the
    DACs, in order, that you want to update. Place the address of the table
    in ES:DX, the number of the first DAC to update in BX, and the number of
    DACs to update in CX.

  Subservice 13h (Set DAC Color Paging (VGA))

    This subservice lets you set up DAC paging in either pages of 16 or 64
    DAC registers. Set BH to the DAC page number to use (0 origin), and BL to
    the paging scheme code (1 . Use 64 DAC pages, 0 . Use 16 DAC pages).

  Subservice 15h (Read DAC Register (MCGA, VGA))

    Subservice 15h lets you read individual DAC registers. You pass it the
    number of the register to read in BX. It returns the red color value in
    DH, the green value in CH, and the blue value in CL.

  Subservice 17h (Read Block of DAC Registers (MCGA, VGA))

    This subservice lets you read a block of DAC registers and store their
    contents in memory. Pass the address of a data buffer in ES:DX, the
    number of the first register to read in BX, and the number of registers
    to read in CX. INT 10h fills the buffer with the RGB (red, green, blue,
    red, green, blue...) values from those registers.

  Subservice 1Ah (Get DAC Paging Status (VGA))

    You can determine the DAC paging status with this subservice. It returns
    the DAC page number currently in use in BH and the paging scheme code in
    BL (1 . 64 DAC pages, 0 . 16 DAC pages).

  Subservice 1Bh (Convert DACs to Grey (MCGA, VGA))

    You can convert a specified number of DACs to the corresponding grey tones
    by using this subservice. Put the number of the first DAC to convert in BX
    and the number of DACs to convert in CX.