Int 10 Fn 4F01  - Vesa Supervga Bios - Get Supervga Mode Information       [V]

   AX = 4F01h
   CX = SuperVGA video mode
   ES:DI -> 256-byte buffer for mode information (see #0077)

Return: AL = 4Fh if function supported
   AH = status
       00h successful
       ES:DI buffer filled
       01h failed
Desc:  determine the attributes of the specified video mode

See Also: AX=4F00h,AX=4F02h

Format of VESA SuperVGA mode information:
Offset Size    Description (Table 0077)
 00h   WORD    mode attributes (see #0078)
 02h   BYTE    window attributes, window A (see #0079)
 03h   BYTE    window attributes, window B (see #0079)
 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 #0080)
 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
       bit 0: color ramp is programmable
       bit 1: bytes in reserved field may be used by application
---VBE v2.0 ---
 28h   DWORD   physical address of linear video buffer
 2Ch   DWORD   pointer to start of offscreen memory
 30h   WORD    KB of offscreen memory
 32h 206 BYTEs reserved (0)

Bitfields for VESA SuperVGA mode attributes:
Bit(s) Description (Table 0078)
 0 mode supported
 1 optional information available
 2 BIOS output supported
 3 set if color, clear if monochrome
 4 set if graphics mode, clear if text mode
---VBE v2.0 ---
 5 mode is not VGA-compatible
 6 bank-switched mode not supported
 7 linear framebuffer mode supported

Bitfields for VESA SuperVGA window attributes:
Bit(s) Description (Table 0079)
 0 exists
 1 readable
 2 writable
 3-7   reserved

(Table 0080)
Values for VESA SuperVGA 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