Though I can install on a 2008 vintage intel imac it does not seem that video acceleration works on the old radeon 2600 gpu. I suspect that support no longer exists for this gpu. Is that right?
This may help:
The Arch wiki has got some more pages on Apple hardware
and on ATI Radeon GPU’s as well
Someone here might be able to assist when system info is provided:
inxi -zv8
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Perhaps you will have more success using the Linux 6.19 kernel - a better support of older AMD GPUs has been advertised for that kernel.
Thanks for the help. But the truth is I mislead you. I meant I could install linux on the imac, and I had put mint on and video did not work. When I actually took the trouble to install manjaro (not much trouble of course) the video appears to work flawlessly (on only a few tests of 1080p video).
So my apologies for wasting your time, but the links you gave are still very valuable.
OMG
indeed 
Mkay 
accepted -
from me, at least.
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