Here's what I've done thus far:
I tried to manipulate 9.2.2 on a CF card -- no dice, neither my TiBook 400 or my AlBook 1.67 would read the OS from CF or from USB via the openfirmware system volume "picker".
I then tried to copy the 9.2.2 CD to a DMG and copy out just the Mac OS ROM. I then burned the resulting image to a CD-RW. For some reason *BOTH* macs will boot from a USB CD-ROM, and the TiBook booted right up to 9.2.2. I didn't modify the new Mac OS ROM file, because I believe that '.MacRISC.' would include MacRISC2 and MacRISC3 machines (2 being machines that boot into OS9 and 3 being machines that boot to OSX). That being said, the resulting boot CD did work on the TiBook (my control machine) and did not work on the Aluminum powerbook.
It could very well be that the machine i'm using for this test is just too new. The OF system "picker" does read the CD, but it doesnt show up on the list. I tried booting from the internal drive and from the USB DVD-RW drive. The DVD-RW drive worked and booted the control machine. There's got to be something in that Mac OS ROM file that needs to be changed, but i'm not sure changing 'MacRISC.' to 'MacRISC3' is going to do the trick. I believe there's some function that needs to be looked at inside of the ROM file that determines whether or not the bootable volume is applicable to boot this machine.
I tried to manipulate 9.2.2 on a CF card -- no dice, neither my TiBook 400 or my AlBook 1.67 would read the OS from CF or from USB via the openfirmware system volume "picker".
I then tried to copy the 9.2.2 CD to a DMG and copy out just the Mac OS ROM. I then burned the resulting image to a CD-RW. For some reason *BOTH* macs will boot from a USB CD-ROM, and the TiBook booted right up to 9.2.2. I didn't modify the new Mac OS ROM file, because I believe that '.MacRISC.' would include MacRISC2 and MacRISC3 machines (2 being machines that boot into OS9 and 3 being machines that boot to OSX). That being said, the resulting boot CD did work on the TiBook (my control machine) and did not work on the Aluminum powerbook.
It could very well be that the machine i'm using for this test is just too new. The OF system "picker" does read the CD, but it doesnt show up on the list. I tried booting from the internal drive and from the USB DVD-RW drive. The DVD-RW drive worked and booted the control machine. There's got to be something in that Mac OS ROM file that needs to be changed, but i'm not sure changing 'MacRISC.' to 'MacRISC3' is going to do the trick. I believe there's some function that needs to be looked at inside of the ROM file that determines whether or not the bootable volume is applicable to boot this machine.