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You are here: MacNN Forums > Enthusiast Zone > Classic Macs and Mac OS > 0S 8.6 install problems on Newest G4/Imacs

0S 8.6 install problems on Newest G4/Imacs
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Jan 24, 2000, 02:43 PM
Our G4 and iMac came pre-installed with OS 9.0. Our lab
is strictly 8.6 at this point, maintained through a software image that is
installed on each machine as needed. The image is a Disk Copy backup of
an 8.6 MacOS software base, with commononly used applications and
managment software.

Every lab machine, up to the Blue and White G3's worked fine with
this arrangement. On the G3's I had to use an updated ROM file, but that
was a minor hassle.

Attempting the standard "wipe the drive and load the disk copy
image" procedure has failed miserably with the G4 and iMac. Regardless of
what steps I take, I get a constant "bus error" after reboot. I have
tried any number of ROM files, System software configurations (large and
small) as well as Zapping PRAM, Updating Disk Drivers, and starting with
extensions on,off and gone entirely.

Nothing works. What's more, I can't install a plain 8.6 because
we went the upgrade route from 8.5 and surprise surprise, you can't boot a
G4 or iMac with an 8.6 CD
I've looked through Apple's help, support, discussion, and update
forums to no avail. I've researched MacInTouch's site and Don has even
made a posting there detailing some of our problem.

What am I missing? Where is the magic button for this? We are
going on a week with these new machines gathering dust and I am hoping you
can provide some of your valuable insights.
Dedicated MacNNer
Join Date: Oct 1999
Location: Cookeville, Tennessee, USA
Status: Offline
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Jan 24, 2000, 09:39 PM
From all I have seen and heard, the 'sawtooth' G-4 (AGP) requires OS 9. I don't think there is any way around it. I think it has to do with the AGP and the way in handles the video signal.
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Jan 25, 2000, 11:54 PM
This (G4 AGP requires OS9 statement) can't be exactly correct. My AGP 450 (Sawtooth) G4 came pre-loaded with 8.6 which works fine. As a matter of fact, some of the early complaints about G4s was they were being released without 9.0 when it was available as a separate sale item. It may be that many users are now happy they have the first 8.6 versions! I have read some posts elsewhere that sort of indicate later issue G4s with 9.0 installed will not accept a "downgrade" to 8.6 but I can't reall the technical explanation of why this is.
Dedicated MacNNer
Join Date: Jan 2000
Location: Seattle, WA
Status: Offline
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Jan 26, 2000, 05:11 AM
Unless you can find a restore CD for these machines from when they shipped with 8.6, you might as well give up right now. You're going to need a very specific system file and ROM file which I doubt you will be able to find without some heavy searching. In order to make them 8.6 compatible, the "Borg" elements of the system need to be in place.. it didn't warrant a different incremental version of the OS because it's just a couple of files to support the hardware, but trust me, starting a machine like that up with anything other than a System Folder which *specifically* supports it is a "Bad Thing™." You might as well live with a couple of machines in your lab being OS 9 based or they will just continue to gather dust.
Grizzled Veteran
Join Date: May 1999
Location: Pasadena, CA USA
Status: Offline
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Jan 26, 2000, 09:36 AM
I tried using the 8.6 CD that came with our first G4/400s and it won't work with the 450s (AGP).
I am the same way with the Macs in the Studio, but I had to concede OS 9 on the new G4 and iMac DV SEs as I did not have the time to try and work this out beyond using the G4/8.6 CD which di not work. The good news is that 9 seems to be running just fine since most of what we use has been updated to be compatible.

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