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Format of XGA subsystem information

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Offset Size Description

00h

DWORD

pointer to null-terminated board OEM string

04h

DWORD

capabilities (see #00072)

08h

DWORD

pointer to 8KB XGA ROM (or NULL)

0Ch

DWORD

pointer to the XGA memory mapped registers

10h

WORD

base address of XGA I/O registers (21x0h)

12h

DWORD

pointer to start of physical video memory (A000h:0000h or B000h:0000h)

16h

DWORD

physical address of 4MB aperture (or NULL if none)

1Ah

DWORD

physical address of 1MB aperture (or NULL if none)

1Eh

DWORD

physical address of 64KB aperture (or NULL if not enabled)

22h

DWORD

physical address of OEM aperture (or NULL if none)

26h

WORD

size of OEM aperture in 64KByte units

28h

DWORD

pointer to list of video modes. The list is a series of WORDs terminated by FFFFh

2Ch

WORD

number of 64KB blocks on the board

2Eh

DWORD

XGA manufacturer ID
byte 0 POS data index 1
byte 1 index 2
byte 2 21xAh index 75h

32h

206 BYTEs

reserved