Response from Apples Performa discussion forum

Subject: Re: Optimizing Productivity on a 6400 ((PART 2)) ((NOT!)) 

Monday, 6/16/97 5:16 CDT

Author: Jim Myers 

Email:jmyers@blacktype.com

------------------------------------------------------------------------
Response:
I have a similar setup, Performa 6400/180/48Mb RAM/512K cache/etc. I cannot use
 MacOS 7.6 or 7.6.1. I also use Open Transport, and the same issue applied to me.I 
switched back to MacOS 7.5.5, and Open Transport flawlessly. For that matter, I've 
been running my Mac without major crashes for three weeks so far.

My Apple Dealer recommends, especially for the 6400, to stay away from 7.6. They 
say that *some* 6400 users will encounter stability problems, even more likely 
under 7.6.1. According to my dealer, about 90% of stability issues go away under 
7.5.5. Of those, the remaining 10% become issues of using 3rd Party harddrives on 
the internal IDE drive.
My recommended steps.
1) Backup your data.
2) Reformat your IDE drive with Drive Setup 1.2 or later. Should be available at 
most Apple Dealers.
3) Restore your MacOS 7.5.3 Performa software.
4) Apply the "PowerPC Interrupt Extension" if it is not already in your Extensions 
folder.
5) Upgrade to 7.5.5 through the net version of the updater.
6) Apply the "6360/54xx/64xx Updater". After installation, and reboot, make sure 
that the "54xx/64xx Update" (note the difference in names) does *not* exist in your
 Extensions folder. If it does exist, then the update did *not* work.
7) Install Open Transport 1.1.2, and OT/PPP 1.0. Do not use the version from the 
Performa CD, that version doesn't work.
8) Restore your data and applications.

I did these steps, and my computer straightened right out.
Hope this helps, email me, or reply here to let us know your progress.