Re: Is it possible to address more than 1MB in real-mode

Wolfgang Kern wrote:
Rod Pemberton wrote:

[...about Unreal/Bigreal]
even I figured just
yesterday that [my OS is] in UnReal mode instead of trueRM ;)

Does this affect your 486DX results w/IRET etc.?

No it didn't affect it at all [on this very early AMD 486DX50],
and I'm surprised that later CPUs keep the limits in 16-bit RM.
I once read in the manuals that segment limits are hardwired
to 64K for RM, but x86 design seem to have changed meanwhile.


That was never true (although the manuals had a lot of baloney in them.) It is, however, true in *V86* mode.

-hpa

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