From: JeongHoon Cho <gentech AT gentech DOT co DOT kr>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Halt in changing graphic mode in Allegro...
Date: Mon, 17 May 1999 11:10:53 +0900
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To: djgpp AT delorie DOT com
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Sean wrote:
> 
> I really have no idea. :)  But I do know if you want an answer you're
> going to have to say what drivers you're using.  And I think looking
> through the Allegro FAQ's would help.  Maybe posting on an Allegro
> board, if there is one, I'm not sure.
> 
> Sean
> 
> JeongHoon Cho wrote:
> >
> > When I change the graphic mode in Allegro, my program crashed.
> > So I tried some Allegro examples. But same result occurred in
> > hi-resolution graphic mode.(640x480 above)
> >
> > I'm using djdev2.02, gcc2.8.1, pgcc1.0.1, Allegro3.11 in MSDOS 6.20
> > and Pentium Celeron 333MHz, i740 graphic card with 8MB SGRAM.
> >
> > Please answer me.


Thank you for answer me.

1) I think it's graphic card problem.
   When I set the graphic mode first, it's done well. ( 640 x 480 etc...
)
   When I changed graphic mode to the other mode, it's failed.
   So I read the source code of allegro. (graphic mode change routines)
   I found the trouble is 'scroll' routine in 'set_gfx_mode'.
   So I remarked the scroll function. 
   And I can change the mode change safty.

2) I'm not using driver ( I think it means graphic card driver. )
   I'm using vesa graphic mode ( VBE 2.0 linear mode )

ps : Sorry for my poor english.