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From:	RayeR <glaux AT centrum DOT cz>
Newsgroups:	comp.os.msdos.djgpp
Subject:	DJGPP program under NTVDM - is possible calling a VDD driver?
Date:	Mon, 19 Nov 2007 02:02:57 -0800 (PST)
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Hi,
I was reading about NTVDM and VDD drivers which purpose is to make a
bridge from DOS application to win32 environment. It would be also
sometimes usefull also for DJGPP programs.But as I readed it is made
for 16-bit apps. The 16-bit program will prepare registers and execute
special invalid opcode. Then NTVDM traps this event and call a
function from 32-bit DLL  which handles registers. 16-bit program will
need to pass some realmode pointers to DLL name, etc in registers. Is
it possible to do it under DJGPP without inline assembler? Or minimize
ASM part as possible? I had done similar thing when calling just one
instruction filled in transfer buffer as a binary chunk and using some
__dpmi_simulate_realmode_procedure_retf or something like that.
And what about VDD support in Vista NTVDM? Will it work there?

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