INT 10 - VIDEO - ALTERNATE FUNC SELECT (ATI,Tatung,Taxan) - ENHANCED FEATURES
        AH = 12h
        BH = 55h
        BL = subfunction
            00h disable enhanced features
            01h enable enhanced features
            02h get status
                Return: AL = status flags (see below)
            03h disable register trapping (CGA emulation)
            04h enable register trapping
            05h program video mode
                ES:BP -> video mode table (see below)
            06h get mode table
                AL = video mode
                Return: ES:BP -> table suitable for mode AL (and subfnc BL=05h)
                        BP = FFFFh on error
SeeAlso: AH=FFh"Oak"

Bitfields for status flags:
 bit 3  set if enhanced features enabled
 bits 7-5 monitor type
        000 PS/2 mono
        001 PS/2 color
        010 multi-sync
        011 Taxan 650 25kHz
        100 RGB
        101 mono
        110 EGA
        111 Compaq internal

Format of ATI VGA Wonder video mode table:
Offset  Size    Description
 00h    BYTE    number of columns
 01h    BYTE    maximum row (number of rows - 1)
 02h    BYTE    scan lines per row
 03h    WORD    video buffer size in bytes
 05h  4 BYTEs   values for Sequencer registers 1-4
 09h    BYTE    value for Miscellaneous Output register
 0Ah 25 BYTEs   values for CRTC registers 00h-18h
                00h horizontal total size (chars)
                01h horizontal displayed (chars)
                02h horizontal sync position (chars)
                03h horizontal sync width (chars)
                04h vertical total size (char rows)
                05h vertical total adjust (scan lines)
                06h vertical displayed (char rows)
                07h vertical sync position (char rows)
                08h interlace mode
                09h max scan line in row
                0Ah cursor start scan line
                0Bh cursor end scan line
                0Ch screen memory start (high)
                0Dh screen memory start (low)
                0Eh cursor address (high)
                0Fh cursor address (low)
                10h light pen (high)
                11h light pen (low)
 23h 20 BYTEs   default palette (values for Attribute Controller regs 00h-13h)
 37h  9 BYTEs   values for Graphics Controller registers 00h-08h

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