Mac OS 8.5 Installation Instructions - Presto PPC Processor Upgrade Card
Troubleshooting Mac OS 8.5 with the Presto PPC
Problem:
The computer does not boot with Mac OS 8.5.
Possible Solution:
Mac OS 8.5 requires a PowerPC processor to operate. You
may need to install the Sonnet Presto PPC processor upgrade card, replace
your logic board battery, and/or boot from the Presto PPC diskette to turn on
the Presto PPC card.
• If the Presto PPC is not installed –
If the Presto PPC processor
upgrade card is removed from the computer you will need to boot
your Macintosh with a version of the System software that supports
the 68040 processor (System 7.1 - Mac OS 8.1). The Presto PPC diskette
supplied with the Presto PPC card has an emergency start-up version
of System 7.5.3. You can use the Presto PPC diskette to temporarily
boot your Macintosh and install or re-enable a version of the system
software on your hard drive that supports the 68040 processor.
•
If the PRAM is reset or logic board battery replaced –
Certain Mac
OS files and control panel settings are stored in PRAM (an area of
the Mac’s memory sustained by the logic board’s battery when the
computer is turned off). Control panel preferences are reset to
Apple-default settings if the battery is low or the PRAM is “zapped”
(by holding down the Command-Option-P-R keys at startup until
the Mac restarts itself a second time).
If the PRAM is reset, the 601 Processor Card setting defaults to off
(68040 is default processor). If this occurs you will need to boot your
computer from the Presto PPC diskette, open the 601 Processor Card
control panel, turn on the Power Macintosh Upgrade Card, and restart
your computer.
Problem:
The computer does not boot directly from the Mac OS 8.5 CD.
Possible Solution:
Since the CD-ROM does not contain the Presto PPC 8.5
Enabler software, it does not have the necessary software to be utilized as a
bootable startup disk with the Presto PPC processor upgrade card. If you
require an alternate startup disk (for possible troubleshooting purposes), the
Presto PPC diskette can be utilized as a boot disk.
Problem:
Apple System Profiler unexpectedly quits.
Possible Solution:
Version 2.1.1 and 2.1.2 of the Apple System Profiler has a
bug that unexpectedly quits the application when run on PowerPC upgraded
Quadra and Centris computers. To fix the problem you need to run either the
Apple System Prof 2.1.1 patcher (if you are using Mac OS 8.5) or Apple System
Prof 2.1.2 patcher (if you are using Mac OS 8.5.1). Both these patches are
available on the Sonnet Presto PPC diskette.
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