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Format of 386|DOS-Extender run-time parameters

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Offset Size Description

00h

2 BYTEs

signature "DX" (44h 58h)

02h

WORD

minimum number of real-mode params to leave free at run time

04h

WORD

maximum number of real-mode params to leave free at run time

06h

WORD

minimum interrupt buffer size in KB

08h

WORD

maximum interrupt buffer size in KB

0Ah

WORD

number of interrupt stacks

0Ch

WORD

size in KB of each interrupt stack

0Eh

DWORD

offset of byte past end of real-mode code and data

12h

WORD

size in KB of call buffers

14h

WORD

flags
bit 0 : file is virtual memory manager
bit 1 : file is a debugger

16h

WORD

unprivileged flag (if nonzero, executes at ring 1, 2, or 3)

18h

104 BYTEs

reserved (0)