From: kunst AT prl DOT philips DOT nl
Subject: Re: Stack Fault in a Dos Box
To: B DOT S DOT Runnacles AT soton DOT ac DOT uk (B.S.Runnacles)
Date: Wed, 15 Feb 1995 16:28:50 +0100 (MET)
Cc: djgpp AT sun DOT soe DOT clarkson DOT edu (DJGPP users list)

> 
> I have a heavily recursive pixel grouping algorithm 
> which I have *successfully*
> implemented using DJGPP.  THe code runs fine under plain old DOS, but when 
> I run it on any images > ~50*50 in a DOS box under WFW3.11, the code falls 
> over complaining of a stack fault.  A symify on the accompanying stack dump 
> reveals that the stack is fairly(!) large.  
> 
> The code is neccessarily recursive and could have a stack as deep as the 
> number of pixels for some planes.  I reported this problem earlier this year, 
> and DJ suggested increasing the minimum stack size using stubedit, I cranked 
> this up to 4Mb to no avail (I have 16Mb).
> 
> Any thoughts?, I am running a 486DX2-66 with WFW 3.11 and MS-DOS 6.22.
> 

Did you allocate a sufficiently large *permanent* swap file in Windoze ?
Lets say, 40 MB ?
I have some recursive routines as well, but they seem to run fine
on my 16MB phys + 40MB swap Windows DOS box.

Did you also specify in the Windows dosprmpt.pif (use PIF editor)
    Mem req. KB desired = -1
    EMS KB Limit = -1   <<============
    XMS KB Limit = -1   <<============
Otherwise you won't get your extended memory at all from Windoze.

Pieter Kunst.