tip for mtools and DOS NBIs

[Ken Yap <ken@nlc.net.au>]

The offset option of mtools can be used to skip the header and first
segment of a DOS NBI, e.g. in ~/.mtoolsrc, put

drive t: file="/tftpboot/dos.nb" offset=4096

Then you can do mdir t:

 Volume in drive T has no label
 Volume Serial Number is 1DE9-302A
Directory for T:/

COMMAND  COM     66663 12-19-1997   7:02 
telbin   exe    181776 08-30-1998  22:48  telbin.exe
ne1000   com      8751 08-29-1998  23:47  ne1000.com
autoexec bat        32 09-01-1998  21:07  autoexec.bat
        4 files             257 222 bytes
                              2 048 bytes free

mtype t:autoexec.bat, etc.

4096 is the value for the version mknbi-dos I used, being 512 for the
header + 3584 for the startup segment. It may be different for other
versions of mknbi-dos.

I think modify access won't work reliably, because the declared size of
the "disk" in the header will not be changed by mtools.
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