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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: /beta/bnu217b.zip won't work in pure DOS (UPX bug??)
Date: Fri, 28 Mar 2008 20:33:46 -0700 (PDT)
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hi,

On Mar 28, 6:28 pm, Cesar Rabak <csra DOT  DOT  DOT  AT yahoo DOT com DOT br> wrote:
> Rugxulo escreveu:> Hi,
>
> [snipped]
>
> > Well, here's what pure MS-DOS 6.22 on real hardware says for me:
>
> > DOSBox 0.72 reports almost the same thing (except ecx=00000005 and
> > error=0002).
>
> Just to grasp completely your report is the "almost the same thing" in
> _the same phisical machine_?

No. The MS-DOS 6.22 computer is a 486 Sx/25 with 8 MB of RAM (heh), so
it's real hardware. I ran DOSBox 0.72 (emulation) on this cpu right
here, Pentium 4 "Northwood" 2.52 Ghz w/ 512 MB RAM (Win XP Home SP2).
But DOSBox emulates a 486DX2, so the instructions supported are
similar.

As mentioned in the other posts, it appears to be an errant CMOVNE
(PPro/P2) instruction, which is not supported on 486s or original
Pentiums.