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Subject:	Re: LARGE HD/WIN 98
From:	David Gillett <[log in to unmask]>
Reply To:	PCSOFT - Personal Computer software discussion list <[log in to unmask]>
Date:	Mon, 1 Jan 2007 14:31:13 -0800
Content-Type:	text/plain
Parts/Attachments:	text/plain (24 lines)

On 31 Dec 2006 at 21:11, Sue Rose wrote:

> Are there any issues with puttin DOS programs on Windows 2000 or on XP
> machines? I had heard that some types of DOS Programs would not run on
> these machines if the program attempted to access hardware. 

  Yes, that's correct.  It doesn't stop you "putting" the program files on 
the machine, but programs that attempt direct access to protected hardware 
will fail/crash when you try to run them.

  (DOS ran in what later CPUs call "real mode" -- on the original 8088 (and 
its brother the 8086) that was the only mode available.  While some 32-bit 
versions of Windows (95/98/ME) continued to support real mode, versions in 
the NT/2K/XP line run DOS programs in "V86" mode, a virtual mode which 
applies the same addressing rules as real mode, but is a "protected" mode in 
that direct hardware access is virtualized through the Win32 kernel and its 
drivers.)

David Gillett

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