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From: Rugxulo <rugxulo AT gmail DOT com>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: FreeDOS, cannot open swap file cwsdpmi.swp
Date: Thu, 27 Oct 2011 05:53:24 -0700 (PDT)
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Reply-To: djgpp AT delorie DOT com

Hi again,

On Oct 27, 2:24 am, jimm <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote:
> On Oct 26, 9:13 pm, Rugxulo <rugx DOT  DOT  DOT  AT gmail DOT com> wrote:
>
> > On Oct 26, 7:25 pm, jimm <jmich DOT  DOT  DOT  AT yahoo DOT com> wrote:
>
> > > I want to completely eliminate the possibility of CWSDPMI using swap.
>
> > Since apparently you're using CWSDSTUB.EXE, you'll have to use
> > CWSPARAM.EXE (or similar) to change the default path "c:\cwsdpmi.swp"
> > to something invalid, e.g. "" (nothing), which (IIRC) by default will
> > just put a '\0' in the drive byte of the path.
>
> how *exactly* do I do that with cwsparam?  do I use this instead of
> cwsdstum or in addition to, or what's going on here?  help me out.
> the manual doesn't work.

================
F:\>copy /b cwsdstub.exe *.bak

cwsdstub.exe => cwsdstub.bak

F:\>cwsparam cwsdstub.exe

Full name of paging file ("" to disable) ? [c:\cwsdpmi.swp] ""

Number of page tables to initially allocate (0=auto) ? [0]

Minimum application memory desired before 640K paging ? [512Kb]

Paragraphs of DOS memory to reserve when 640K paging ? [3840]

Paragraphs of memory for extra CWSDPMI internal heap ? [256]

Maximum size of swap file ? [128Mb]

Value of run option flags ? [0]

F:\>cwsparam -v cwsdstub.exe

-value-            -field description-

*Disabled*         Full name of paging file ("" to disable)

0                  Number of page tables to initially allocate
(0=auto)

512Kb              Minimum application memory desired before 640K
paging

3840               Paragraphs of DOS memory to reserve when 640K
paging

256                Paragraphs of memory for extra CWSDPMI internal
heap

128Mb              Maximum size of swap file

0                  Value of run option flags

F:\>fc cwsdstub.bak cwsdstub.exe

Comparing F:\cwsdstub.bak and F:\CWSDSTUB.EXE

0000538E:     63  c      00

F:\>scrndump jim.txt

================

Basically I just typed verbatim "" (two double quotes) for null path.
Then I just kept hitting enter for default values in []. As you can
see, all it does it patch one byte to make it invalid.