From:	"Lennart Marien" <lennartm AT metronet DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	What is wrong with this?
Date:	Wed, 29 Apr 1998 12:38:53 +0200
Organization:	Metronet
Lines:	39
Message-ID:	<6i7002$2ka$1@news.metronet.de>
NNTP-Posting-Host:	hamburg1.pop.metronet.de
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

Hi!
I try to change the pallette in VESA Mode 101h(640x480x256), using the
Interrupt number 0x10:
The variable pal holds  768 RGB values

char pal[768];
__dpmi_regs r;
int *sel;
int seg;

seg=__dpmi_allocate_dos_memory((768+15)>>4,sel);
_dosmemputb(&pal,768,seg * 16 + 0);
/*My DOSMem should contain value of pal now */
r.x.ax=0x1012;
/*ah==0x10 al==0x12 (correct?)*/
r.x.bx=0;
/*bx first color to set*/
r.x.cx=256;
/*number of colors to set*/
r.x.es=seg;
/*segment of my DOSMem*/
r.x.dx=0;
/*Offset of my DOSMem*/
__dpmi_int(0x10,&r);
/*call interrupt*/

What the hell is wrong with it?
I always get a "general protection fault"
Something wrong with the _dosmemputb?
Is there another way of changing the pallette instead
of calling real mode interrupts?

thanks in advance!

cu

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