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Jemm v5.66, bugfix for Phar Lab TNT DOS extender apps (DOSX)

posted by Rugxulo Homepage, Usono, 27.08.2007, 01:28

> > (What uses that freak-o extender, old MASM?? Norton Ghost??? Whatever it
> > is, it's something I don't have, heh.)
>
> it's Ontrack "Easy Recovery" and "Data Advisor"
OpenWatcom doesn't even (barely?) support that extender anymore, right? So why would anyone use 'em? Seriously, what advantages did / does it have? (Just curious, feel free to ignore.)

> I have to agree. :yes: However, I bet that v5.64 also won't work, while
> v5.63 most likely will.
I don't reboot this P4 much, it's usually used for other purposes. So, I dunno where such a change (if any) occurred.

> > At first stumble, I turned on VERBOSE ("EPROM at C000", "EPROM at
> Ce80"),
> > and I can only assume the problems are because of the Ultra IDE BIOS
> > extension for the extra HDs in this P4 computer (since none of my
> others
> > had problems).
>
> Why didn't you reveal earlier that you own such a cool machine with a ROM
> *not* beginning on a 4 kB page boundary? That's a very good test case,
> you're engaged as Jemm "number one" tester.
My bro added a few extra HDs to this cpu, and that necessitated adding an IDE adapter (which brought about the Ultra IDE BIOS from CMD Technology (c) 2001).

Actually, that causes a bit of instability booting in pure DOS. I can't even press F1 or F11 b/c it does something weird for "Windows 2000" or whatever (lame).

> > Then today I got exception 9 (whatever that is) with the latest
> > JEMM.
>
> Well, X=C000-CFFF should suffice. And exception 9 is "impossible" on P4s.
> :-D

Impossible how? I don't think I remembered that incorrectly. But anyways, I had to keep tweaking because it kept hanging. Only the first time was I able to exit via Esc, the others required reboots.

> > So I ended up using "X=C000-CFFF I=TEST VERBOSE", which
> > apparently doesn't crash or hang or frell up (yet, anyways). So,
> > that seems to be stable enough.
>
> Hmm, I=TEST should make things less stable. If it improves stability, then
> there might be another bug which somehow "cures" the effects of the first
> one.
Obviously, my testing was not 100% exhaustive, so I may have done something wrong. Or it could be something else entirely (stupid Ultra IDE BIOS extension bugs, probably).

> > P.S. I don't think it's a bug in JEMM or FreeDOS, actually (though it's
> > possible).
>
> FreeDOS is innocent, but Jemm most likely isn't.
As much as I shudder when people claim FreeDOS is buggy (vs. non-free DOSes), I have to admit that it does have some slightly minor flaws. Of course, it's strong enough to run most things with no problem, so I never complain. But truth is truth, it's not perfect. But it's still actively developed, so I'm not too worried. ;-)

---
Know your limits.h

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