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Format of Matrox-specific VESA extensions information

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Offset Size Description

00h

7 BYTEs

signature "VBE/MGA"

07h

10 BYTEs

??? (01h 01h 00h 00h 00h 00h 00h 00h 00h 07h)

11h

WORD

BIOS version (high byte = major, low byte = one-digit minor)

13h

DWORD

manufacturer name (ASCIZ "Matrox")

17h

DWORD

ASCIZ card name

1Bh

DWORD

ASCIZ string (empty string on card examined)

1Fh

DWORD

ASCIZ vendor name

23h

DWORD

ASCIZ BIOS file base name

27h

DWORD

PINS

2Bh

WORD

video memory size in 64K units

2Dh

DWORD

linear address of linear frame buffer

31h

DWORD

linear address of MGA control aperture

35h

WORD

PCI bus/device for card???

37h

201 BYTEs

unused??? (cleared to 00h)