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From: wilker@gauss.math.purdue.edu (Clarence Wilkerson)
Newsgroups: comp.os.minix
Subject: Re: IBMPC Demo Disk
Message-ID: <6343@mentor.cc.purdue.edu>
Date: 20 Feb 91 01:42:04 GMT
References: <1991Feb19.182447.6756@sbcs.sunysb.edu> <1991Feb19.213539.7257@syd.dms.CSIRO.AU>
Sender: news@mentor.cc.purdue.edu
Reply-To: wilker@gauss.math.purdue.edu.UUCP (Clarence Wilkerson)
Organization: Purdue University, West Lafayette
Lines: 86

Here's a couple of Turbo C hosted on PC programs I wiped up to
do the chore of writing  the demo disk to floppy (RAWFILL)
and another one to read a 360k minix floppy ( VOLCOPY). I think
DEBUG may wrap around when you do the w100 0 0 number   method.
I didn't get that to work either!

RAWFILL.C:

#include <stdio.h>
#include <dos.h>
char buffer[520];
main(argc,argv) int argc; char *argv[];
{ int drive, c, next,count;
  char *s;
  FILE * infile;
if ( argc < 3) {
   fprintf(stderr,"RAWFILL file drive \n");
   return(-1);
}
infile = fopen(argv[1],"rb");
if( infile == (FILE *)NULL ) {
   fprintf(stderr,"Bad file name.\n");
   return(-1);
}

s = argv[2];
c= *s;
drive = ( toupper(c) ) -65 ;
if ( (drive < 0) || ( drive > 1) ) {
   fprintf(stderr,"Bad drive name.");
   return(-1);
}
next = 0;
while ( !feof(infile) ){
  count=fread(&buffer[0],512,1,infile);
  abswrite(drive,1,next,&buffer[0]);
  next++;
  if ( next > ( 80*9 ) ) goto toomany;
}
toomany:
 fclose(infile);
 return(0);
}


VOLCOPY.C :

#include <stdio.h>
#include <dos.h>
char buffer[520];
main(argc,argv) int argc; char *argv[];
{ int drive, c, next,count;
  char *s;
  FILE * outfile;
if ( argc < 3) {
   fprintf(stderr,"VOLCOPY drive filename \n");
   return(-1);
}
outfile = fopen(argv[2],"wb");
if( outfile == (FILE *)NULL ) {
   fprintf(stderr,"Bad file name.\n");
   return(-1);
}

s = argv[1];
c= *s;
drive = ( toupper(c) ) -65 ;
if ( (drive < 0) || ( drive > 1) ) {
   fprintf(stderr,"Bad drive name.");
   return(-1);
}
next = 0;
while ( next < (9*80) ){
  absread(drive,1,next,&buffer[0]);
  count=fwrite(&buffer[0],512,1,outfile);
  next++;
}
toomany:
 fclose(outfile);
 return(0);
}

If you get an abort/retry/ question from MSDOS, do a retry.
This on my AT clone did seem to write and read the demo disk.
Your mileage may vary!
Clarence Wilkerson