Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!helios!inetg1!dprrhb
From: dprrhb@inetg1.ARCO.COM (Reginald H. Beardsley)
Newsgroups: comp.os.minix
Subject: Re: Trouble building a 1.44m boot disk (using mcc and Turbo-C)
Message-ID: <1991Apr17.173809.19172@Arco.COM>
Date: 17 Apr 91 17:38:09 GMT
References: <1991Apr16.033808.26969@syd.dms.CSIRO.AU>
Sender: dprrhb@inetg1 (Reginald H. Beardsley)
Organization: ARCO Oil & Gas Company
Lines: 41


  There is a rather subtle problem with Guy Helmer's bootblok.s for the 286 using 1.44MB drives.
(NB I have not tried the 386 version, but it probably has the same problem)

THE PROBLEM IS IN THE MAKEFILE NOT BOOTBLOK!
  
  make image produces the image file and then copies it to the floppy with the following command:

  cp image /dev/fd0

If you examine the source for floppy.c you will find that 1.44MB is not supported properly.
What you actually get is an 18 sector disk with the executable written only in the first 
15 sectors of each track.

So.... you can do one of two things.

1) edit the makefile to read:

   cp image /dev/PS0

2)  make floppies with:
 

    cp image /dev/PS0 
    
    cp image /dev/ps0

    cp image /dev/at0

    etc. as appropriate for the device you are using

PS:  Guy's bootblok.s will work with /dev/fd0 if you change tracksiz from 18 to 15.

Have fun and thank you Guy!

-- 
Reginald H. Beardsley       
ARCO Information Services
Plano, TX 75075           
Phone: (214)-754-6785
Internet: dprrhb@arco.com