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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