PROJECT BLACKHAT

[Frank Cox]

On Mon, 26 Nov 2007 12:04:25 -0500
Lamar Owen <lowen at pari.edu> wrote:

> although it appears that the claim is that x64 processors in long 
> mode won't run 16-bit code at all.

That's correct.  In my (recent) experience, DOSEMU runs approximately 13x
slower on F8-x86_64 than it did with F7-i386, on exactly the same machine.

Conversely, it also shows that you CAN still run this type of software on
x86_64, at the cost of requiring your CPU to do more emulation to get  you
there. Perhaps MS is simply not interested in adding this capability to Windows.

This is a very interesting read if you want to know more about this subject:

http://thebs413.blogspot.com/2005/10/what-is-x86-64-long-mode-memory-model.html



-- 
MELVILLE THEATRE ~ Melville Sask ~ http://www.melvilletheatre.com