Summary - downgrade 4/60 from 4.1. to 4.0.3

From: Jeff Aldrich (
Date: Sat Feb 02 1991 - 14:15:08 CST

First, my apologies for the delay in replying to the kind souls who
were so quick to respond to my plea wrt difficulties downgrading a
4/60 from 4.1 to 4.0.3. My original request:
> For reasons known only to the management, I have to uninstall the 4.1
> on a 4/60 and load 4.0.3, sometime in the next few hours, God willing.
> I don't know how to do it. I had hoped that I could just boot from
> 4.0.3 tape, format the disks, and load the OS, but it's become obvious
> that it's not that simple. Live and learn, I hope.
> The system: 4/6o, one internal Quantum 105 as sd0, one internal
> Conner 212 as sd1, one external Archive 150 drive. I have no other
> systems available to me running 4.0.3, unfortunately. This has gotta
> be doable. Can anybody out there bail me out of this one? Ten
> thousand thanks in advance....

The gist of the replies, in order of frequency:

1. make sure you aren't mistakenly using a 4.0.3 tape, instead of the
proper 4.0.3c tape

2. make sure you have an install tape and not just an update tape

3. try booting single user under 4.1 and fsck -y -c to convert to
4.0.3 layout, then try the install.

As it turns out, downgrading is indeed as simple as booting from the
appropriate tape and reloading the OS (and, of course, putting back
your previously backed-up files). The problem that had me confused
was a coincidental failure of the SCSI controller, making it reeeeal
hard to read any kind of tape at all. Replacing the CPU resolved the
issue, and once that was done the downgrade was a trivial matter. If
anyone would care for a compilation of all the responses, I'll keep
them handy for a couple of weeks. Special thanks to:

Vaughan Pratt <>
Leslie Dreyer <>
Manavendra K. Thakur <>
Pat Barron <>
Jonathan Corbet <corbet@stout.atd.ucar.EDU>
David St. Pierre <david@mother.srv>
Peter Galvin <>
Robert L Krawitz <rlk@Think.COM>
Steve D. Miller <steve@umiacs.UMD.EDU>
Jon A. Tankersley <>
John DiMarco <>
M.W. Goheen <>
Richard Kurtz <>
David Grootwassink <>

 Jeff Aldrich <aldrich@sunrise.Stanford.EDU>
 R&D Engineer Center for Design Research
                 Stanford University

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