On 7/28/2025 6:55 PM, Ralf Quint via Freedos-user wrote:
On 7/25/2025 2:17 PM, tsiegel--- via Freedos-user wrote:
the 8088 chips (at least the nec V20 my xt machine had) could handle
the 80186 command set, this allowed it to run (some, most?) 80286
programs. I was able to run 286 specific versions of multiple
programs when I had an IDS 8088 switchable between 4.77 and 8 MHZ.
It sure was nice, although I'm not sure it speeded things up all that
much, sometimes the 286 specific versions would have additional
features. Minor
Sorry Travis, but this is utter nonsense. For all practical purposes,
at least as far as anything programming is concerned, the 8086 and
8088 chips are identical. There is only a difference on the hardware
level to work externally on an 8bit wide data bus, to be able to work
easier with at the time existing peripheral 8 bit chips.
Ok, and that's fine, but then you continue and say:
And the fact that the V20/V30 chips understand (most of) the 80186
command set is because NEC decided to add those, just like the added
8080 emulation mode. Beside being a tad faster than the equivalent
Intel chip, there is no function difference between an V20/V30 and an
Intel 8088/8086.
Now that makes no sense.
How can there be no functional difference if they support an additional
command set?
If you try to run a 286 specific program on an 8086, it won't work, if
you run it on a necv20, it does, how that translates into no functional
difference is beyond me, but whatever works for you.
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