Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!rphroy!cfctech!sharkey!tygra!dave
From: dave@tygra.UUCP (David Conrad)
Newsgroups: comp.lang.pascal
Subject: Re: Graphics and Exec
Message-ID: <1991Mar27.095641.2368@tygra.UUCP>
Date: 27 Mar 91 09:56:41 GMT
References: <24959@hydra.gatech.EDU>
Distribution: usa
Organization: CAT-TALK Conferencing System, Detroit, MI
Lines: 28

In article <24959@hydra.gatech.EDU> gt0652b@prism.gatech.EDU (I don't know man, he was just here) writes:
>Hi, I am trying to write a graphical interface that also has a command line.
>My problem is that when I try to set things up to run a Dos command, my
>egavga driver won't run.
>
>	for graphics, i need to uses initgraph(GrDriver, grmode?)
>
>	for dos, I need to use the compiler directive
>	      {$M 20000,0,0}
>
>The problem is that when I include the above compiler directive my 
>graphics procedures report that egavga was not installed.
>

Initgraph (and many other graph routines such as fonts and fills) use space
on the heap.  You cannot {$M ?, 0, 0} and have them work.  On the other hand,
DOS needs some memory to run in, so you can't {$M ?, 0, 655360} and use Exec.
The solution is to reserve some heap, but also leave some memory for DOS.
Why don't you try something like {$M 20000, 32768, 65536} (note that some
minumum heap space must be present, this helps insure successful Initgraph.)

Dave Conrad
sharkey!tygra!dave
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