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
Organization:	Inet Internet Services
Lines:	38
Message-ID:	<373F7AAD.905CA409@gentech.co.kr>
References:	<37390E4B DOT E3F7A390 AT gentech DOT co DOT kr> <373EF518 DOT 87E460D7 AT enter DOT net>
NNTP-Posting-Host:	203.239.40.65
Mime-Version:	1.0
X-Trace:	news.nuri.net 926907311 18388 203.239.40.65 (17 May 1999 02:15:11 GMT)
NNTP-Posting-Date:	17 May 1999 02:15:11 GMT
X-Mailer:	Mozilla 4.6 [en] (Win98; I)
X-Accept-Language:	en
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp
Reply-To:	djgpp AT delorie DOT com

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.

- Raw text -