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From: Cobus.Debeer@p0.f1.n7101.z5.fidonet.org (Cobus Debeer)
Newsgroups: comp.lang.modula2
Subject: Re: TopSpeed 3.0 First Impressions
Message-ID: <3278.2868588C@puddle.fidonet.org>
Date: 26 Jun 91 02:26:04 GMT
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I have found that the MGDEMO program crashes on certain video adaptors 
and traced the cause of the problem to the code where the video mode is 
 In line 1961 of the GRAPH.mod file the bios function is called without 
the AH register being set to 0.  This can be fixed by changing the 
assignment of AL = 010 to AX := 010 or by making ah zero.  The reason 
why it does not crash consistently is that AH is mostly zero.  When it 
happens to be non-zero you go off into space.
 
There is another bug in the code.  When using VGA graphics the 
structure indicating the hrizontal and vertical pixel count returns the 
correct values but the pixel plotting functions use the EGA limitsto 
decide if a point should be plotted.
 
regards
Cobus de Beer



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