I'm at my wit's end with this beige G3 (300 Mhz, 30GB IDE hard disk,
384MB RAM) that I've been prepping to give away. I've tried installing
both Linux and OS X 10.3 on it, but run into  what seems to be the
same roadblock.

The video card on it is an IMS Twin Turbo, which I need to use since
it has a VGA out port on it, and I don't have any sort of adapter to
convert the native Mac video out to VGA. OS 9.1 is peachy keen using
the twin turbo's VGA out, but other operating systems seem to insist
on ignoring the PCI video card and just use the internal video. Trying
to boot into OS X results in the gray Apple logo with the spinny thing
showing up onscreen as it boots up, but then that freezes. Eventually
I hear the happy "Welcome to OS X for the first time" music playing,
letting me know that OS X has booted up. And I swear it plays it in a
very mocking manner. This g3 is very close to being defenestrated, and
then immolated. I'm assuming that the problem here is that at the last
moment, OS X decides that it's going to use the internal video and
ignore the PCI card.

Similarly, I couldn't get Linux to use the twin turbo, even if it
kinda sorta saw that it was there. Xorg just refuses to use the PCI
card, instead firing up the internal ATI graphics.

I've pushed the CUDA button, zapped PRAM multiple times, and tried
using the Open Firmware to set the pci-probe-list value to fffbffff,
which a number of sites on the net say is the way to force the G3 to
look to the PCI bus instead of internally for the video card. This
last bit doesn't seem to take, however... if I use printenv, the pci-
probe-list value stays stuck at the default value of -1.

Do I have to somehow unlock Open Firmware's ability to set the pci-
probe-list values? Is there some other way to force the G3 to ignore
the internal graphics and use the PCI card?

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