INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - EXTENDED FUNCTIONS
        AX = 007Fh
        BH = function
            03h  lock current mode
                allows current mode (VGA or non-VGA) to survive re-boot
            04h  enter MDA mode
            05h  enter CGA mode
            06h  enter monochrome VGA mode (also switches to video mode 7)
            07h  enter color VGA mode (also switches to video mode 3)
            0Ah,0Bh,0Ch,0Dh,0Eh,0Fh  WRITE PARADISE REGISTERS 0,1,2,3,4,5
                (port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh)
                BL = value to set in the paradise register
            1Ah,1Bh,1Ch,1Dh,1Eh,1Fh READ PARADISE REGISTERS 0,1,2,3,4,5
                (port 03CEh indices 0Ah,0Bh,0Ch,0Dh,0Eh,0Fh)
                Return: BL = value of the paradise register
                        BH = 7Fh if successful
            29h-2Fh ??? (Paradise VGA for Dell, 7/24/91)
Return: AL = 7Fh if successful (AT&T VDC600)
        BH = status (Paradise/Dell)
            00h invalid function
            7Fh successful
Desc:   set emulation mode or access proprietary extended data registers
SeeAlso: AX=007Eh,AH=FF"Oak"

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