==========

DEVICE=JEMM386.EXE NOINVLPG 

HARD CRASH

Several lines of
   Bad or missing Command Interpreter: ÉÉÉ Enter the full shell command line: 
with no carriage returns or line feeds, ending with
   Bad or missing Command Interpreter
followed by

Jemm386: exception 0D occured at CS:EIP=C800:000011E5, ERRC=00000000
SS:ESP=D0DE:00000004 EBP=000000A0 EFL=00033293 CR0=80000011 CR2=00000000
EAX=00000E0D EBX=07FF0007 ECX=00000000 EDX=000000D1 ESI=00040FA0 EDI=00090FA0
DS=0070 ES=B800 FS=00D1 GS=F000 [CS:IP]=9C 2E FF 1E D7 11 CF 66
Press ESc to abort program




> Date: Sat, 21 Mar 2009 01:57:59 +0100
> From: e.a...@jpberlin.de
> To: freedos-user@lists.sourceforge.net
> Subject: Re: [Freedos-user] FreeDOS on Virtual PC 2007
> 
> 
> Hi Robert, Shane,
> 
> > Ben Armstrong ("a Program manager on the core virtualization team
> > at Microsoft") recommends the following for MS-DOS on
> > http://blogs.msdn.com/virtual_pc_guy/archive/2004/10/21/246136.aspx
> 
> Note that this is from 2004 so it cannot be about Virtual PC 2007 ;-)
> 
> > device=C:\DOS\EMM386.EXE RAM I=B100-B7FF I=C600-C7FF
> 
> Re-using part of mono text buffer (B100-B7FF) and part
> of a typical VGA BIOS area (C600-C7FF) sounds a bit
> desperate if you ask me... Modern EMM386 such as the
> JEMM386 from www.japheth.de that you recommended also
> auto-detect the size of the VGA BIOS anyway :-).
> 
> > I=CC00-CFFF I=E600-EFFF FRAME=d000
> 
> 
> 
> This is odd - Shane Baggs suggested quite different options on 11 March:
> 
> > I'm running it on Virtual PC 2007 under Windows XP on a laptop with a 
> > Pentium M.
> > It crashed at first, but it's now solid as a rock with this line in 
> > FDCONFIG.SYS:
> >> DEVICE=C:\FDOS\BIN\JEMM386\JEMM386.EXE NOEMS X=CC00-CFFF NOINVLPG
> > ... NOEMS is optional.
> 
> With NOEMS, no page frame is allocated (it could start at D000 or
> later, up to E000). This gives you 64 kB more UMB but old EMS 3.2
> software will be unhappy. EMS 4.0 compatible software stays happy.
> 
> > NOINVLPG was written by Japheth specifically for [Virtual PC]
> 
> Note that classic FreeDOS EMM386 is outdated but probably
> did not use INVLPG anyway so you need no specifically-made-
> for-Virtual-PC option to fix VPC compatibility either ;-).
> 
> > The X=CC00-CFFF was arrived at through testing by trial and error.
> 
> So Shane suggests to EXCLUDE CC00-CFFF while Ben suggested
> to INCLUDE CC00-CFFF (and D000-DFFF and E600-EFFF...) That
> gives me the idea that Ben wants to say that you should
> exclude E000-E5FF instead of CC00-CFFF for "Virtual PC of
> the year 2004". Can somebody who has Virtual PC 2007 have
> a look at memory contents and about the effects of...
> 
> X=cc00-cfff
> versus
> X=e000-e5ff
> 
> ...on the stability of FreeDOS with EMM386 / JEMM386? Thanks!
> 
> I have the following IDEA: Maybe the X=cc00-cfff, while NOT
> using the NOEMS option, had an influence on where the EMS
> page frame was, pushing it at the "bad area" - and pushing
> UMB area away from it. Because EMS is less often used than
> UMB, you still get fewer crashes if the bad area is only in
> use while EMS is accessed... You can use MEM or Quarterdeck
> MFT / Manifest to see where EMS page frame and UMBs are :-).
> 
> Shane, could you post some relevant parts of MEM /D and MEM /E
> output with and without X=cc00-cfff combined with with/without
> NOEMS option along with information which of those 2 * 2 config
> possibilities are stable and which are not? Thank you... :-).
> 
> Eric
> 
> 
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