Are PowerPC CPU upgrades supported?
Sure! Many people upgrade their slow 601, 603, 604, or G3 CPUs with a faster 604, G3, or G4 CPU. Actually, it’s currently necessary if you have a PowerMacintosh 7500 with the original PowerPC 601 chip. People have reported success with upgrading the CPU in original PCI PowerMacintosh systems (7300 – 9600), supported PowerBooks, and earlier G3 systems. The common manufacturers are Newer Technology, Powerlogix, Sonnet, and XLR8. If the CPU works in Mac OS, it should work in NetBSD. Some users have reported that their system won’t boot NetBSD if a new CPU is installed into the early PCI PowerMacintosh systems (7300 – 9600). If you find that this is the case (i.e. you downgrade to a 604 and NetBSD works), then you may need to boot Mac OS once to install the nvramrc patches for your CPU daughtercard. From this point on, you should not use System Disk, as it will install its own nvramrc, overwriting your CPU manufacturer’s nvramrc. Use Boot Variables instead. This will mean that your monitor
