---- Le dim., 23 mai 2021 10:11:02 -0400 Eric Auer <e.a...@jpberlin.de> écrit
----
>yes, EMM386 could switch the entire system back to
>real mode for certain things, but that would make
>the performance loss significantly worse than what
>you get with any EMM386 anyway unless you use the
>VME (V86 mode extensions, enable with command line
>option "VME", requires at least 486 CPU).
I have the feeling you will disagree but I believe you should search
how to make thing more performant mosly when you have a performance
problem.
>Are you sure that you NEED emm386? You could simply
>work with only HIMEM or XMGR, without (j-) emm386
>and without jemmex. This will mean no UMB and also
>no EMS. But while no UMB will mean less free DOS RAM
>below 640 kB, not many apps or TSRs really want EMS.
I really think I don't need EMS.
But I am mostly here for testing FreeDOS and help others not
to encounters the problem I encounter.
In my opinion, instructions for turning off and on protected mode,
and storing, restoring registers value are pretty cheap in time.
Moreover in that case, it seems insignifiant compare to time to speak
with an hard disk.
My suggestion, is make it work "slow" but working for everyone, and
allow an option to be "fast" and insecure.
>...and of course you
>may still have to apply hat MCB chain editing trick
>to protect this special 5800:0 area your BIOS uses.
I think we don't see things the same way on that point.
I believe my BIOS is not very special (AMIBIOS), just relatively recent.
So I believe others are likely to encounter reserved memory in the
memory area DOS normally use.
I believe the real solution is not to ask users to edit FreeDOS MCB chain,
but modify FreeDOS to allow memory not to be consecutive and automatically
not use memory reserved by the BIOS.
>http://mercurycoding.com/downloads.html#DOS has the
>(almost?) newest HIMEMX, HIMEMSX, XMGR, UHDD, UDVD2,
>RDISK and other drivers and DEBUG and JWASM :-)
I particularly like HIMEMSX.
It should be usefull to me, as having 8 Gb, it would allow to use
the memory over 4Gb.
Does it work with PAE (Physical Address Extension)?
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