Chosen Solution
I have a source for pre OS X os for Macs. I’m unsure how to create an install flash drive from an Intel High Sierra machine. I’ve four G4/G5 machines that I’d like to setup. @danj you there ?
So first thing this model won’t boot from a USB drive ;-{ You have to use either a bootable CD/DVD (DVD+R DL/DVD±RW/CD-RW) or a FireWire drive (400 MB/s). You also have a bit of a chicken and egg problem too! You need a working OS-8/OS-9 system to prep the optical disk or FireWire drive if you are expecting to run OS-8/OS-9. This series also supports OS-10! The highest supported level for your G5 systems is OS-X 10.5.8 and for your G4 systems it is OS-X 10.4.11 (15”/17” Flat Panel systems). Frankly, I would go with OS-10 on these systems as it will be easier to get the needed grey or retail version of the disks.
