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#176 2016-08-17 22:31:01

Registered: 2016-03-10
Posts: 3

Re: Mac OS 9 on Unsupported Hardware

nanopico wrote:

I had this same issue and have now solved it.
It's hanging on the sound device.
It doesn't like it for some reason.
The compatible property on
/pci@F2000000/mac-io/i2s/i2s-a  is set to i2sbus.
OS 9 knows about this, but some properties are missing so it hangins trying to start the sound manager.
If you change that property to some other known sound device it work, but you will have no sound what-so-ever.

Here is what you can do in open firmware to disable that.

dev /pci@F2000000/mac-io/i2s/i2s-a
" screamer" encode-string " compatible" property

If you still have the multiprocessor extensions enabled it will hang up right before it goes to the desktop.
Only this hang up is much worse as it causes a lot of the interrupt controller to be disabled so you can't drop to a debugger. 

There seems to be a lot of extension that really don't play well on this machine.  I'm currently working on figuring that one out.

Also all the ATI drivers out there cause it to hang. 
At this point you need to make sure there is nothing relate to ATI in the extensions folder.
Then in open firmware you can do the graphic-options hack to make the screen use the full resolution

This fix has worked and I am now running OS9 on the 1.42 iBook. Some problems are:
Trackpad problems, refuses to work, external mouse required.
System recognizes machine as PowerBook 6,7. (Not really a problem, just a slight annoyance)
No sound
No brightness control

I am not sure if the ATI driver will load on this machine, it uses an ATI,Snowy adapter. I cannot test this though, because I am unable to transfer files to the machine at the moment.


#177 2016-10-01 12:58:05

Registered: 2016-03-09
Posts: 5

Re: Mac OS 9 on Unsupported Hardware

Can the ROM from OS9General.img control brightness on iBook G4?
iBook G3 Restore CD also has this image.


#178 2016-11-04 22:44:10

Registered: 2016-11-04
Posts: 2

Re: Mac OS 9 on Unsupported Hardware

Hey I'm very new to all this but I just want to get Mac OS 9 running on my eMac 1.25 ghz model. I downloaded the Generic 1021v1 general sit file but where do i start with the installation process?


#179 2016-11-09 21:57:35

Registered: 2016-11-04
Posts: 2

Re: Mac OS 9 on Unsupported Hardware

Thank you so much to everyone who made this possible! after much trial and error I finally got OS 9 running on my eMac! everything seems to be fine except for the fact that there's only one color mode.


#180 2018-02-12 18:01:23

Registered: 2018-02-12
Posts: 1

Re: Mac OS 9 on Unsupported Hardware


I'm trying to see if I can get 'NDRV' support for a PowerBook6,7 with a Radeon 9550 under OS 9.

Do you mind sharing how you extracted the 9200 'NDRV' from the ATIDriver binary?

I noted that the binary is around 3.5MB and your ATI VIA is only about 128k, so you must have trimmed out the other graphics card ndrv's?

I would be thankful for any help you could offer.


I extracted the 9550 'NDRV' from OS X Leopard, and tried to put it in the ATI Rom Extender, but it doesn't load.

I opened it in Hexedit, the Data fork, and replaced the ATY,Bugsy from Joy!peffpwpc..... to the end of the file. Then I edited the Resource fork and replaced ATY,Bugsy with ATY,Snowy.

I'm not sure I should have paste it to the end of the file, I know an 'NDRV' starts with Joy!peffpwpc... but I don't know where it ends.

If I just use an unmodified  ATI Rom Extender, and replace ATY,Bugsy with ATY,Snowy in both the resource and data forks, it loads the Bugsy 'NDRV', but the screen goes black, as it's the wrong 'NDRV'.

Maybe there is a checksum byte?


Got it, first you can't edit with Hexedit, it corrupts the file.

I made a version of  iMac's ATI Via Extension that works for Radeon 9550.

1. Gets rid of the External ghost display.
2. Internal LCD works correctly, all supported display modes, and color or grey scale now work.
3. I don't have the mini vga to test the external display, but I'd bet it works just fine.

Last edited by darthnvader (2018-02-13 14:33:39)


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