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Format of DOS/16M XBRK structure

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Offset Size Description

00h

DWORD

linear address of first available byte

04h

DWORD

linear address of last available byte + 1 ???

08h

DWORD

real-mode address of XBRK structure???

0Ch

DWORD

???

10h

2 BYTEs

???

12h

WORD

segment of ???

14h

8 BYTEs

???

1Ch

512 BYTEs

protected-mode IDT

21Ch

N BYTEs

protected-mode GDT