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Date: Sat, 03 Jul 1999 10:35:46 -0300
To: djgpp AT delorie DOT com
From: "Cesar S. Rabak" <csrabak AT ipt DOT br>
Subject: Re: DPMI and CALDERA-DOS
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At 13:42 01/07/99 GMT, Alex exobot AT my-deja DOT com wrote:
>  djgpp AT delorie DOT com wrote:
>>
[snipped]
>Hello,
>
>thanks for your response, but I think the
>problem is not the Installation of djgpp
>or rhide, it is the DPMI-server itself.
>
>I try to explain my problem
>- I'm using caldera DrDos 7.03 as platform on
>  a 486DX4/100 16MB and compile at the command-line.
>  As testprograms I'm using "hello-world" wich
>  waites for a keypress or rhide (as a more complex one).
>
>Here the effects:
>1) I'm running DOS with Caldera-Emm386 as DPMI-
>   server.
>   1.1. no TaskManager:
>     - everything is fine. I get errormessges
>       when compiling programs with systax errors
>   1.2. TaskManager enabled, running 1 Task:
>     - I get no errormessges when compiling
>       programs with systax errors
>   1.3. TaskManager enabled, running 2 Tasks
>        with programms needing DPMI (Hello world)
>     - normally it works, sometimes the system
>       crashes or hangs.
>2) I'm running DOS with cwsdpmi instead of DR-DOS-EMM386
>   with DPMI enabled.
>   1.1. no TaskManager:
>     - everything is fine. I get errormessges
>       when compiling programs with systax errors
>   1.2. TaskManager enabled, running 1 Task:
>     - everything is fine. I get errormessges
>       when compiling programs with systax errors
>   1.3. TaskManager enabled, running 2 Tasks
>        with programms needing DPMI (Hello world)
>     - I get the error mesage:
>       "Warning: cannot open swap file C:\cwsdpmi.swp"
>     - or the system crashes.
>
>So my problems are:
>- I can't compile when the Taskmanager ist enabled (when
>  using EMM386 of DR-DOS as dpmi-server)
>- I can't run two programms build with djgpp without crash.

This is a documented problem with OpenDOS/DR-DOS in DJGPPFAQ 6.3.

>
>Do I try the impossible (Caldera Tasmanager and Protected
>mode-programms, did I have a configuration problem or do
>I need another DPMI-Server ?

The configuration you´re trying at present still has problems that renders
it no operational. 

Although it is reasonable that with effort it could be made to work, it is
necessary to check with Caldera:

	If they have any means to help you to solve this problem;
	if they already released the source code for the OS, so one interested and
knowledgable soul could pinpoint the reason for the incompatibility;
	see what are the needs for a DJGPP program to run under TaskManager.

Cesar