INT 10 - VESA SuperVGA BIOS - GET SuperVGA MODE INFORMATION
        AX = 4F01h
        CX = SuperVGA video mode
        ES:DI -> 256-byte buffer for mode information (see below)
Return: AL = 4Fh function supported
        AH = status
            00h successful
                ES:DI buffer filled
            01h failed
Desc:   determine the attributes of the specified video mode
SeeAlso: AX=4F00h,AX=4F02h

Format of mode information:
Offset  Size    Description
 00h    WORD    mode attributes
                bit 0: mode supported
                bit 1: optional information available
                bit 2: BIOS output supported
                bit 3: set if color, clear if monochrome
                bit 4: set if graphics mode, clear if text mode
 02h    BYTE    window A attributes
                bit 0: exists
                bit 1: readable
                bit 2: writable
                bits 3-7 reserved
 03h    BYTE    window B attributes (as for window A)
 04h    WORD    window granularity in KB
 06h    WORD    window size in KB
 08h    WORD    start segment of window A
 0Ah    WORD    start segment of window B
 0Ch    DWORD   -> FAR window positioning function (equivalent to AX=4F05h)
 10h    WORD    bytes per scan line
---remainder is optional for VESA modes in v1.0/1.1, needed for OEM modes---
 12h    WORD    width in pixels (graphics) or characters (text)
 14h    WORD    height in pixels (graphics) or characters (text)
 16h    BYTE    width of character cell in pixels
 17h    BYTE    height of character cell in pixels
 18h    BYTE    number of memory planes
 19h    BYTE    number of bits per pixel
 1Ah    BYTE    number of banks
 1Bh    BYTE    memory model type (see below)
 1Ch    BYTE    size of bank in KB
 1Dh    BYTE    number of image pages
 1Eh    BYTE    reserved (0)
---VBE v1.2+---
 1Fh    BYTE    red mask size
 20h    BYTE    red field position
 21h    BYTE    green mask size
 22h    BYTE    green field size
 23h    BYTE    blue mask size
 24h    BYTE    blue field size
 25h    BYTE    reserved mask size
 26h    BYTE    reserved mask position
 27h    BYTE    direct color mode info
 28h 216 BYTEs  reserved (0)

Values for memory model type:
 00h    text
 01h    CGA graphics
 02h    HGC graphics
 03h    16-color (EGA) graphics
 04h    packed pixel graphics
 05h    "sequ 256" (non-chain 4) graphics
 06h    direct color (HiColor, 24-bit color)
 07h    YUV (luminance-chrominance, also called YIQ)
 08h-0Fh reserved for VESA
 10h-FFh OEM memory models

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