>>>>>Are you saying that apps that I've written on my XP with AMD processor will not work on an Intel Win10 pc?
>>>>>Rich
>>>>
>>>>No, that's not what I say. AMD CPU's are Intel-compatible, what Microsoft calls "Intel type", so you don't have to worry.
>>>
>>>The x86-64 instruction set (commonly called AMD64 by many entities other than Intel) was created by AMD, not Intel.
>>>
>>>So, Intel CPUs are AMD-compatible ;)
>>
>>not debating your statement, but as vfp is only 32 bit, only the part on the left of the hyphen is important ;-))
>>Although I am pretty certain that vfp6 and higher cannot be made to run on an Intel 8086, guessing at least 80386 instruction set is neccessary, which would imply 80386SX as lower bound ;-)
>
>Hi Thomas,
>a software requirement will limit the processor.
>I think VFP6 needs Win95 at least.
>This, otoh, needs a 386DX minimum see here
>
>:)

I still have the various retail boxes - VFP5 and VFP7, plus Visual Studio 6.0 (which includes VFP6). What the boxes say:

Version  Processor           OS                      RAM
-------  ---------           --                      ---

VFP5     386DX/25 or higher  W95 or NT3.51 or later  8MB NT: 16MB
         486 preferred                               Pref 12MB W95, 16MB NT

VFP6     Pentium-class       W95 or NT4.0 SP3        W95: 24MB, NT: 32MB
         P90+ preferred      or later                Pref 48MB for both

VFP7     Pentium-class       W98 or later            64MB
                             WNT 4.0 SP6 or later    128MB recommended
                             W2K SP1 or later

So VFP6 was in kind of a grey area.

I never personally ran W95/98/Me on my own systems, I went to NT 3.51. Back in those days RAM was expensive, I got 32MB RAM at wholesale for $1,500. My NT 3.51 machine was a P133. The 386DX I had before that only ran Windows 3.1 and had 8MB RAM.

Even high-end 386s such as the Compaq Deskpro 386/20 topped out at 16MB RAM so wouldn't have met the minimum spec for W95 for VFP6. I suspect running W95 or later on a 386DX of that class would have been unusably slow.

Despite all that WP claims W98 can be installed on a 386 using an undocumented switch: https://en.wikipedia.org/wiki/Windows_98#System_requirements .

So yes, it looks like VFP6 can theoretically be run on a high-end 386 running W95 or W98. But my guess is it would be unbearably slow. I wonder if anyone ever did that?