Bootable SysV/AT 3.5" disk

[Brian Lloyd]

I have succeeded in constructing a bootable 3.5" disk for uPort 286
unix.  It is a kludge but it works.  Here is the process:

1.  Using the motherboard configuration utility configure the 3.5"
    drive to be a 1.2Mb 5" floppy.

2.  Format a 1.44Mb 3.5" floppy under DOS.  DOS will format the floppy
    as 80 cylinders, 2 tracks/cyl, and 15 sectors/track.  The floppy
    will have a capacity of 1.2 Mb instead of 1.44 Mb.

3.  Kill DOS (a good idea in any case) and bring up SysV/AT.

4.  Use dd to copy the 1.2 Mb boot disk to the 3.5" disk you formatted
    above.  Treat the 3.5" disk as if it was a 1.2Mb floppy (use minor
    dev of 70 for drive0 or 78 for drive 1).

The system will now boot off the 3.5" floppy.  It may be an
unsophisticated solution but it works.

Brian Lloyd
uunet!n3dmc!brian