From:	"Bonifati" <abonifati AT telsa DOT it>
Newsgroups:	comp.os.msdos.djgpp
Subject:	wait for vertical retrace
Date:	Fri, 4 Jun 1999 20:24:02 +0200
Organization:	Centro Servizi Interbusiness
Lines:	21
Message-ID:	<7j95e8$ajm$1@fe1.cs.interbusiness.it>
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To:	djgpp AT delorie DOT com
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Reply-To:	djgpp AT delorie DOT com

i copied this code to wait for the vertical retrace from a book:

void Wait_Vertical_Retrace (void)
{
  while ( (inp (0x3da) && 0x8) != 0 ) {};
  while ( (inp (0x3da) && 0x8) == 0 ) {};
}

my program works without waiting for vertical retrace; when i include it, it
fails on run-time (i think it goes in infinite loop into
Wait_Vertical_Retrace function).
i can't figure out what's wrong with this function. please help me!

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