![hybrid mac os 8.6 and 9.2.2 hybrid mac os 8.6 and 9.2.2](http://classicmacs.org/wp-content/uploads/2010/04/macos9_box.jpg)
![hybrid mac os 8.6 and 9.2.2 hybrid mac os 8.6 and 9.2.2](https://c1.neweggimages.com/ProductImage/AHXPD210321TX246.jpg)
The G4 chips used to achieve the speeds of these processors were created long after Apple created the ROM\u8217 s that are used in those vintage machines.
HYBRID MAC OS 8.6 AND 9.2.2 UPGRADE
Hang or crash occurs before desktop appears.Īfter installing my new Crescendo/PCI processor upgrade in a Power Tower Pro, I can hear the boot chime when I turn the computer on, but the video display never comes up.Īfter installing a Crescendo/ PCI G4 700 or 800 MHz upgrade, I opened Apple System Profiler and it is reporting the processor type as unknown and the speed as 450 MHz. The computer's standard startup process takes noticeably longer after upgrading to any Mac OS 9.x system from Mac OS 8.6 or earlier. The Crescendo/Encore installer hangs, or crashes the system occurs most often when run from the Sonnet installer CD while using Mac OS 9. The speed indicated on the G3 or G4 chip on my Sonnet processor upgrade doesn't seem to match the speed of the upgrade I purchased.
![hybrid mac os 8.6 and 9.2.2 hybrid mac os 8.6 and 9.2.2](https://image.dhgate.com/0x0s/f2-albu-g8-M00-46-F5-rBVaV150djWABMxCAAU73O6mcws761.jpg)
May I discard my original CPU after installing Sonnet's upgrade cards? Unfortunately, Sonnet cannot provide support for this modification, although the Crescendo/PCI G4 800 (and 700) will operate with it.
HYBRID MAC OS 8.6 AND 9.2.2 FOR MAC OS
There is a web site, which provides tools to do this for Mac OS 9.2.1 and 9.2.2. It turns out that it is possible to add these sections of system software back in, and create a hybrid Mac OS 9.2 that will run with the 9500 family and the Crescendo/PCI G4 800 and 700. To accomplish this, they removed some specific parts of the operating system software that enabled operation on the Power Macintosh 9500 family and earlier machines beige Power Macintosh G3 models are the oldest systems still supported under Mac OS 9.2. When Apple created Mac OS 9.2, they decided to limit the number of machines supported to make the testing and qualification job easier. Why can't I run Mac OS 9.2 on my computer upgraded with a Crescendo/PCI G4 800 (or 700)? What are the known incompatibilities with the Crescendo/PCI G4 700 and 800? The Crescendo/Encore installer hangs, or crashes the system occurs most often when run from the Sonnet installer CD. Document Version: AD-PPC-G4-1000-A-030906Īdendum instructions for installing the Sonnet Crescendo/PCI G4 1.0 GHz Processor Upgrade Card into a supported Power Mac computer.