Subj : Re: CPU Hog
To   : Tony Langdon
From : Digital Man
Date : Tue Aug 09 2022 12:10:51

  Re: Re: CPU Hog
  By: Tony Langdon to fusion on Tue Aug 09 2022 07:52 pm

 > -=> On 08-08-22 19:49, fusion wrote to Nightfox <=-
 >
 >  fu> On 08 Aug 2022, Nightfox said the following...
 >
 >  Ni> As far as I can tell, NTVDM64 is meant to work on 64-bit Intel/AMD
 >  Ni> processors. Where did you see that it was for PowerPC?
 >
 >  fu> an excerpt from the ntvdm wiki:
 >
 >  fu> Since virtual 8086 mode is not available on non-x86-based processors
 >  fu> (more specifically, MIPS, DEC Alpha, and PowerPC) NTVDM was instead
 >  fu> implemented as a full emulator in these versions of NT, using code
 >  fu> licensed from Insignia's SoftPC.
 >
 > I was led to believe that it was possible to create a DOS VM, using the
 > hardware virtualisation capabilities of modern processors, so theoretically
 > there is a way around the lack of virtual 8086 mode in 64 bit mode at the
 > hardware level, if I'm right.

Unfortunately, no. 64-bit x86 processors, when operating in "long mode" (64-bit mode) do not support the "virtual 86" mode that they have in 32-bit mode.
-- 
                                            digital man (rob)

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