At 05:45 PM 8/24/2004 -0300, Alain wrote:
Michael Devore escreveu:
I could map RAM to X=TEST which is about as safe as you can automatically get for UMB's, but that would appear to break MS compatibility for RAM option. What the heck does the documentation stating that RAM option uses "all available adapter space" mean anyway?
Is RAM supposed to be strictly an A000-B7FF inclusion, e.g. I=A000-B7FF?
My help (from MS-DOS 6.22) does not say that, loosely retranlating to english it says "EMM386.EXE will use all available extended memory for UMB". This is not a good explanation either.
I always understood that it is suposed to get all "normal" areas. As far as I remember it gets UMB between the Video Bios and the Main Bios. With graphics mode, the A000-B7FFF is not usefull anyway.
That would put RAM back to its current behavior, which is NULL or in other words, do the default FreeDOS behavior of map all available extended memory, i.e. those not signed as ROM or used as EMS page frame.
Let's put it the other way around: What do you recommend for basic automatic UMB enabling (and eventualy nothing more)?
X=TEST. Still can't catch everything out there and may be "too safe" in other situations, but best we can do for a conservative automatic mode. Seems to work pretty well.
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