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INT 10 - VIDEO - Paradise VGA, AT&T VDC600 - EXTENDED FUNCTIONS
        AX = 007Fh
        BH = 00h  set VGA operation
        BH = 01h  set non-VGA operation
            color modes (0,1,2,3,4,5,6) will set non-VGA CGA operation.
            monochrome mode 7 will set non-VGA MDA/Hercules operation.
        BH = 02h  query mode status
            Return: BL = 00h if operating in VGA mode, 01h if non-VGA mode.
                    CH = total video RAM size in 64k byte units.
                    CL = video RAM used by the current mode.
        BH = 03h  lock current mode
            allows current mode (VGA or non-VGA) to survive re-boot.
        BH = 04h  enter CGA mode (AT&T VDC600 only)
        BH = 05h  enter MDA mode (AT&T VDC600 only)
        BH = 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.
        BH = 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.
Return: AL = 7Fh if successful (AT&T VDC600)
SeeAlso: AX=007Eh