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real & protected mode
Posted: Sat Dec 27, 2003 12:00 am
by sysprogrammer
How can we switch to real mode to execute real mode code under windows?
RE:real & protected mode
Posted: Sun Dec 28, 2003 12:00 am
by carbonBased
You can't.
However, any code executed inside a DOS prompt, in windows, is executed inside a VM86 handler. It's not real mode "exactly" but as far as your DOS app is concerned, it is.
RE:real & protected mode
Posted: Sun Dec 28, 2003 12:00 am
by sysprogrammer
yeah, i know that working inside windows on DOS prompt is not real mode but virtual 8086 mode becsause its is not dos it is session window.Thats why i m trying to switch to exactly REAL mode.
RE:real & protected mode
Posted: Sun Dec 28, 2003 12:00 am
by carbonBased
You can't.
It's a priveleged instruction, and any self respecting OS won't allow user level applications to alter CR0.
You only choices are to install DOS, or run it in a virtual machine.
Cheers,
Jeff
RE:real & protected mode
Posted: Wed Dec 31, 2003 12:00 am
by Khumba
You could create a shortcut (.PIF file) for the program and force the user to run it in DOS mode.
RE:real & protected mode
Posted: Wed Dec 31, 2003 12:00 am
by carbonBased
that still results in VM86 mode in most (all?) forms of windows, though... despite what it looks like