From: "Ricardo Cropalato de Melo" <cropalat AT svn DOT com DOT br>
Newsgroups: comp.os.msdos.djgpp
Subject: Read a boot sector
Date: Fri, 25 Aug 2000 09:12:51 -0300
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To: djgpp AT delorie DOT com
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Reply-To: djgpp AT delorie DOT com

I write this single program to read a floppy boot sector.

// Code
#include <stdio.h>
#include <sys/segments.h>
#include <dos.h>

int main(void)
{
    union REGS regs;
    struct SREGS sregs;
    unsigned char sector[512];

    regs.h.ah =0x02; // read a sectors from a disk
    regs.h.dl = 0x00;   // drive number
    regs.h.ch = k;      // track   0 to 79 - max 80
    regs.h.cl = j;      // sector     0 à 17 - max 18
    regs.h.dh = i;      // head    0 e 1  - max 2
    regs.x.bx = (unsigned) sector;
    sregs.es = _my_ds();

    int86x(0x13,&regs,&regs,&sregs);

    return (regs.h.ah); // zero if ok
}

And it is fine. But if a put it in a function and call this function, a get
a GPF. Anybody know why? Any idea?

TIA

Cropalato
cropalat AT svn DOT com DOT br