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Author Topic: Radeon 9250 working on MacOS 7.6.1  (Read 786 times)

meow_mx

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Radeon 9250 working on MacOS 7.6.1
« on: May 12, 2024, 06:20:24 PM »

I was jealous of the MacOS 9 users having access to the Radeon 9250, and love an excuse to do something silly and educational. So, I hacked up Radeon 9250 drivers that work on 7.6.1!

https://www.macintoshrepository.org/73857-radeon-7000-9250-driver-for-macos-7-6-9-2-2

My 9250 test card is fussy about DVI at higher resolutions (even more than my Mac Mini) which is a pity because System 7 at 3440x1440 looks really cool.
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ssp3

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #1 on: May 12, 2024, 07:58:46 PM »

Which extensions and drivers did you change? A bit more information could be useful to others. Thanks!
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meow_mx

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #2 on: May 12, 2024, 08:06:13 PM »

Full steps to reproduce the modifications are included in the download. The gist of it is similar to what Bolle did for the 9250 in MacOS 9: binary edits to put the appropriate PCI ID in the right places.

ATI Resource Manager was the real trick for pre-OS9 compatibility: later versions crash at startup, but fortunately the last MacOS 7.6-compatible version seems to have shipped with undocumented support for the Radeon 8500 :-D
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ssp3

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #3 on: May 12, 2024, 08:42:12 PM »

Thanks!

ATI Resource Manager was the real trick for pre-OS9 compatibility: later versions crash at startup, but fortunately the last MacOS 7.6-compatible version seems to have shipped with undocumented support for the Radeon 8500 :-D

That's an interesting detail. I'm trying to tackle the latest ATI ndrv problem with "silent upgrade" Mini in the other thread and I also concluded that ATI Resource Manager could be responsible for hangs at startup.
http://macos9lives.com/smforum/index.php?topic=7088
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Knezzen

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #4 on: May 12, 2024, 11:25:00 PM »

Wow!!! Great addition! Make sure to post about it at System 7 Today as well! :)
Need to dig out a 9250 and test it on my 8600.

EDIT:
I see that you already did ;)
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Jubadub

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #5 on: May 13, 2024, 12:11:22 AM »

This is really awesome. :)
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DieHard

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #6 on: May 13, 2024, 08:43:55 AM »

Quote
I was jealous of the MacOS 9 users having access to the Radeon 9250, and love an excuse to do something silly and educational. So, I hacked up Radeon 9250 drivers that work on 7.6.1!

"silly" damn, please be silly more often, that is quite awesome!!
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meow_mx

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Re: Radeon 9250 working on MacOS 7.6.1
« Reply #7 on: May 13, 2024, 11:35:27 AM »

Wow!!! Great addition! Make sure to post about it at System 7 Today as well! :)
Need to dig out a 9250 and test it on my 8600.

EDIT:
I see that you already did ;)

Especially interested in your results with 1920x1080 and bigger resolutions via DVI-D output. I was hoping to get 3440x1440@30Hz from my PowerTower, but my 9250 PCI card's DVI output is flaky at that setting or any other large resolutions.
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