INT 10 - VIDEO - FUNCTIONALITY/STATE INFORMATION (PS,VGA/MCGA)
        AH = 1Bh
        BX = implementation type
            0000h return funtionality/state information
        ES:DI -> 64-byte buffer for state information (see below)
Return: AL = 1Bh if function supported
            ES:DI buffer filled with state information
BUG:    Trident 8900 (BIOS D3.0 11/12/91) and Trident 9000 (C3.0 10/25/91)
          do not correctly set the fields at offsets 27h and 29h of the
          state information
SeeAlso: AH=15h,AX=1A00h,AX=1F01h

Format of state information:
Offset  Size    Description
 00h    DWORD   address of static funtionality table (see below)
 04h    BYTE    video mode in effect
 05h    WORD    number of columns
 07h    WORD    length of regen buffer in bytes
 09h    WORD    starting address of regen buffer
 0Bh    WORD    cursor position for page 0
 0Dh    WORD    cursor position for page 1
 0Fh    WORD    cursor position for page 2
 11h    WORD    cursor position for page 3
 13h    WORD    cursor position for page 4
 15h    WORD    cursor position for page 5
 17h    WORD    cursor position for page 6
 19h    WORD    cursor position for page 7
 1Bh    WORD    cursor type
 1Dh    BYTE    active display page
 1Eh    WORD    CRTC port address
 20h    BYTE    current setting of register (3?8)
 21h    BYTE    current setting of register (3?9)
 22h    BYTE    number of rows
 23h    WORD    bytes/character
 25h    BYTE    display combination code of active display
 26h    BYTE    DCC of alternate display
 27h    WORD    number of colors supported in current mode
 29h    BYTE    number of pages supported in current mode
 2Ah    BYTE    number of scan lines active
                (0,1,2,3) = (200,350,400,480)
                Tseng ET3000: (4,5,6 = 512,600,768)
 2Bh    BYTE    primary character block
 2Ch    BYTE    secondary character block
 2Dh    BYTE    miscellaneous flags (see below)
 2Eh  3 BYTEs   reserved (00h)
 31h    BYTE    video memory available
                00h = 64K, 01h = 128K, 02h = 192K, 03h = 256K
 32h    BYTE    save pointer state flags (see below)
 33h 13 BYTEs   reserved (00h)

Bitfields for miscellaneous flags:
 bit 0  all modes on all displays on
 bit 1  gray summing on
 bit 2  monochrome display attached
 bit 3  default palette loading disabled
 bit 4  cursor emulation enabled
 bit 5  0 = intensity; 1 = blinking
 bit 6  PS/2 P70 plasma display (without 9-dot wide font) active
 bit 7  reserved

Bitfields for save pointer state flags:
 bit 0  512 character set active
 bit 1  dynamic save area present
 bit 2  alpha font override active
 bit 3  graphics font override active
 bit 4  palette override active
 bit 5  DCC override active
 bits 6-7 reserved

Format of Static Functionality Table:
Offset  Size    Description
 00h    BYTE    modes supported #1
                bit 0 to bit 7 = 1 modes 0,1,2,3,4,5,6 supported
 01h    BYTE    modes supported #2
                bit 0 to bit 7 = 1 modes 8,9,0Ah,0Bh,0Ch,0Dh,0Eh,0Fh supported
 02h    BYTE    modes supported #3
                bit 0 to bit 3 = 1 modes 10h,11h,12h,13h supported
                bit 4 to bit 7 reserved
 03h    BYTE    (IBM) reserved
                (Tseng ET3000/4000) modes supported #4
                                bit 0 to bit 7 = modes 18h-1Fh supported
 04h    BYTE    (IBM) reserved
                (Tseng ET3000/4000) modes supported #5
                                bit 0 to bit 7 = modes 20h-27h supported
 05h    BYTE    (IBM) reserved
                (Tseng ET3000/4000) modes supported #6
                                bit 0 to bit 7 = modes 28h-2Fh supported
 06h    BYTE    (IBM) reserved
                (Tseng ET3000/4000) modes supported #7
                                bit 0 to bit 7 = modes 30h-37h supported
 07h    BYTE    scan lines supported
                bit 0 to bit 2 = 1 if scan lines 200,350,400 supported
 08h    BYTE    total number of character blocks available in text modes
 09h    BYTE    maximum number of active character blocks in text modes
 0Ah    WORD    miscellaneous function support flags (see below)
 0Ch    WORD    reserved
 0Eh    BYTE    save pointer function flags (see below)
 0Fh    BYTE    reserved

Bitfields for miscellaneous function support flags:
 bit 0  all modes on all displays function supported
 bit 1  gray summing function supported
 bit 2  character font loading function supported
 bit 3  default palette loading enable/disable supported
 bit 4  cursor emulation function supported
 bit 5  EGA palette present
 bit 6  color palette present
 bit 7  color paging function supported
 bit 8  light pen supported
 bit 9  save/restore state function 1Ch supported
 bit 10 intensity blinking function supported
 bit 11 Display Combination Code supported
 bits 12-15 reserved

Bitfields for save pointer function flags:
 bit 0  512 character set supported
 bit 1  dynamic save area supported
 bit 2  alpha font override supported
 bit 3  graphics font override supported
 bit 4  palette override supported
 bit 5  DCC extension supported
 bits 6-7 reserved

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