From: hars AT dutch DOT nl
Message-Id: <199612102145.QAA19099@delorie.com>
To: djgpp AT delorie DOT com
Date: 10 Dec 1996 13:29:02 +0100
Subject: DOS/BIOS direct Floppy access

Hello all,

I am trying to check the floppy drive. I copied some source(many thanks to the
author) so I can test this. There are still some things going wrong although as
 far as I can tell the code is OK. I try to write C++ as much as possible :)

The code compiles and runs. The program returns floppy status 1. This means a i
ncorrect floppy command??.

Can some one shine some light on this problem.

If I get this to work I want to expand this to reading sectors and displaying t
he sector, especially the 1e and 2e FAT, which is a 12 bits FAT. Can some on gi
ve me some hints. I will also look in the mail-archives.

Grtx & thnx

Roy

#include <iostream.h>
#include <dpmi.h>
#include <go32.h>
#include <dos.h>
#include <conio.h>

int get_floppy_drive(int) ;

main()
{
  int test_drive = 0x00 ; // drive A
  int floppy_status ;
  clrscr() ;
  while((floppy_status = get_floppy_drive(test_drive)) == 6 ) ;
  cout << "floppy status = " << floppy_status << endl ;
  if (!floppy_status)
  {
    cout << "Able to access disk. " << endl ;
  }
  else
    cout << "Unable to access disk. " << endl ;
  return 0 ;
}

int get_floppy_drive(int test_drive)
{
  _go32_dpmi_registers registers ;

  registers.h.ah = 0x02 ; // bios disk read
  registers.h.al = 0x01 ; // read one sector
  registers.h.ch = 0x00 ; // track zero
  registers.h.cl = 0x01 ; // sector 1
  registers.h.dh = test_drive ; // drive 0x00=A 0x01=B
  registers.x.bx = (__tb & 0x0f) ;
  registers.x.es = (__tb >> 4) ;
  registers.x.ss = registers.x.sp = 0 ;
  _go32_dpmi_simulate_int(0x13, &registers) ;
  return(registers.h.ah) ;
}