Load palette

        Entry:
          AX = CD0Ah
          CX:BX -> palette structure (see below)
        Return:
          AL = 00h successful
             = 80h unsuccessful

        Format of palette structure:

        Offset  Size    Description
         00h    BYTE    bits per pixel for which palette is to be used
                        (1,2,4,6, or 8)
         01h    2**N    palette translation values, one per possible pixel
                        value