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Format of VESA SuperVGA mode information

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Offset Size Description

00h

WORD

mode attributes (see #00080)

02h

BYTE

window attributes, window A (see #00081)

03h

BYTE

window attributes, window B (see #00081)

04h

WORD

window granularity in KB

06h

WORD

window size in KB

08h

WORD

start segment of window A (0000h if not supported)

0Ah

WORD

start segment of window B (0000h if not supported)

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 #00082)

1Ch

BYTE

size of bank in KB

1Dh

BYTE

number of image pages (less one) that will fit in video RAM

1Eh

BYTE

(VBE 1.0-2.0) reserved (00h)
(VBE 3.0) reserved (01h)
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
VBE v3.0

32h

WORD

bytes per scan line in linear modes

34h

BYTE

number of images (less one) for banked video modes

35h

BYTE

number of images (less one) for linear video modes

36h

BYTE

linear modes: size of direct color red mask (in bits)

37h

BYTE

linear modes: bit position of red mask LSB (e.g. shift count)

38h

BYTE

linear modes: size of direct color green mask (in bits)

39h

BYTE

linear modes: bit position of green mask LSB (e.g. shift count)

3Ah

BYTE

linear modes: size of direct color blue mask (in bits)

3Bh

BYTE

linear modes: bit position of blue mask LSB (e.g. shift count)

3Ch

BYTE

linear modes: size of direct color reserved mask (in bits)

3Dh

BYTE

linear modes: bit position of reserved mask LSB

3Eh

DWORD

maximum pixel clock for graphics video mode, in Hz

42h

190 BYTEs

reserved (0)

Note:

While VBE 1.1 and higher will zero out all unused bytes of the buffer, v1.0 did not, so applications that want to be backward compatible should clear the buffer before calling