AH = 10h
        AL = 0: set palette register
                BL = palette register to set
                BH = color value to store
        AL = 1: set border color register
                BH = color value to store
        AL = 2: set all palette registers
                ES:DX = pointer to 17-byte list
                        bytes 0-15 = values for palette regs. 0-15
                        byte 16 = value for border register
        {ega}
        AL = 3: toggle intensity/blinking bit
                BL = 0: enable intensity
                BL = 1: enable blink
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