I have now tried every trick in the book to get the Radeon X1300 AGP card to show MorphOS install screen. I will give up now, I think.

I used the NVidia card to boot into Open Firmware, then coded NVRAM to boot from CD next time. I then shutdown, swapped the NVidia card for the X1300, hoping it would show up after a successful boot of MorphOS from CD. It did not.

I then used the NVidia card again to get into Open Firmware. I set NVRAM back to standard, and instead tried boot-command, telling the command to boot the boot.img from CD. Then shut down, swapped cards, booted - nothing. Screen stayed black.

I then used the NVidia card again to get into Open Firmware. Instead of creating a boot-command to boot from CD, I created one to boot from USB stick. Swapped cards again - screen stayed black.

It seems that the info that X1300 standard PC card running on G5 is either a myth - or I am still doing something wrong. Any help would be appreciated.

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I believe you're not the one to blame here.
Some cards just won't work, sadly, and nobody knows why.
I myself have a Radeon X1650 Pro I bought thinking it would work in a G5 and it doesn't. And I'm sure the vanilla PC Sapphire X1950 AGP did work (as I used one with my Dual Processor 2,7 GHz for quite some time)
I guess you can either keep trying or just roll the dice and flash the 9200 (and move the capacitor).

There's an article about flashing cards for MorphOS here. It's in Polish but auto translation is your friend.

Pro tip: The capacitor can be as well replaced with just a drop of tin. It will work anyway.

> It seems that the info that X1300 standard PC card
> running on G5 is either a myth [...]

Have you confirmed that the card works in general (in an old PC or with Linux on your G5)? If it does, then there's probably, as koszer assumes, an unknown incompatibility between MorphOS and the card. The bad thing is that while one X13xx/X15xx/X16xx/X18xx/X19xx card by one manufacturer works, another X13xx/X15xx/X16xx/X18xx/X19xx card by another manufacturer won't. It's a gamble with the AGP-based PowerMac G5 sadly, and there's no known pattern :-/

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Maybe somebody could share a BIOS from a known-working card and we could try flashing the obviously incompatibile card with it and see if that helps?

Yes, the card works fine in a PC.

Thank you so much for your feedback. At least I now feel more sane again. Seems like I just happened to pick an X1300 variant that does not work.

I will try to get a Mac-compatible card. They are more expensive, but I don't want to do this again.

Thanks guys