Message-ID:	<36143299.5CBD3686@geocities.com>
From:	Sahab Yazdani <sahaby AT geocities DOT com>
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Newsgroups:	comp.os.msdos.djgpp
Subject:	0xA0000 or 0xA000?
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Date:	Thu, 01 Oct 1998 20:55:37 -0500
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

OK, I'm simply trying to access mode 13h and plotting a pixel and then
getting out! Though Whenever I run my program I  either get nothing on
the screen (0xA000) or get a page fault (0xA0000)!  Now my code is still
really simple and looks something like this:

#include <dos.h>
#include <conio.h>

void main() {
	union REGS regs;

	regs.x.ax = 0x13;
	int386(0x10, &regs, &regs);

	unsigned char *memory = (unsigned char *) 0xA000;

	memory[ 320 ] = 15;

	getch();

	regs.x.ax = 0x03;
	int386(0x10, &regs, &regs);
}

Now with this program I get nothing on the screen, but if I switch
"memory" to 0xA0000 I get a page fault that reads something like this:

Page fault at eip=0000187e, error=0006
eax=000a0140 ebx=003e4180 ecx=003e4180 edx=000a0000 esi=00000054
edi=0000cf84
ebp=003e1fd4 esp=003e1fc8 program=E:\SAHAB\CPROJ\MASSAC~1\MASS.EXE
cs: sel=00af  base=82cbc000  limit=003f1fff
ds: sel=00b7  base=82cbc000  limit=003f1fff
es: sel=00b7  base=82cbc000  limit=003f1fff
fs: sel=0087  base=00011550  limit=0000ffff
gs: sel=00c7  base=00000000  limit=ffffffff
ss: sel=00b7  base=82cbc000  limit=003f1fff

Call frame traceback EIPs:
  0x0000187e
  0x00004196


Now my first question is which of these memory locations is it: 0xA0000
or 0xA000?

PS.  Thanks to everyone who responded to my MAKEFILE post!
-- 
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* Sahab Yazdani              * Those who look wise among the         *
* Thornhill Secondary School * Foolish, look foolish amoung the wise *
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* Click the link to visit my portion of The Neverhood                *
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