Thanks to Greystash, I tried the mentioned nvram code without the screamer part and my audio works perfectly!

So for anyone with a Powerbook G4, 15 inch 1Ghz, you only need the following code:

dev /cpus/PowerPC,G4@0
80010201 encode-int " cpu-version" property
device-end

Thank you Greystash, I was already using the code in the nvram... so that wasn't working... but it gave me an idea to try without the code... and it works! So very happy... thank you for prompting me 

Hi stewc,

Have you tried applying the following to the NVRAM in Open Firmware, alongside the other commands?

Code: [Select]

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

This is a fix that allowed some models with an incompatible sound device to boot into OS9. I've never actually tried the sound functionality with this fix on machines that have the incompatible device, so it may be worth a try.
It might not work, and if it breaks things just delete those lines.

Some have reported getting sound working with unsupported Mac Mini models by plugging something into the headphone jack, so that might be an easier solution.

Anyone willing to trade-even their working 1.33 GHz G4 Mac mini…
for a fully working, Refurbed and Upgraded 1.42 GHz or a 1.5 GHz?

OR… simply post pics / info of the specific heatsink present in your 1.33 GHz?

[PM FdB or FBz]

Any particular reason(s) why we should continue to exclude (or blur out)
the actual serial numbers of these older machines from posts / images?

Especially now, after they’re all mostly twenty years old (or older).

[Just an old, deeply engrained habit?]

AppleSerialNumberInfo.com seems to return the most info from Apple S/Ns.
But restricted to searching two per 24 hour period. Unless you pay for more.
Recently paid for more — but never received confirmation or access codes.
So it took me four days to get info on seven different Mac minis.

Refund requested.

Hi, thanks for the help. I haven't actually tried booting from a CD; I haven't fallen for that. From OSx, I copy the system folder to the OS9 partition, and neither has worked.

I have two partitions: the first 50GB for OS9 with OS9 drivers, and the second up to 128GB for OSx, also with OS9 drivers.

Maybe I should use Target Disk and copy from another Mac running OS9?

The way I'm doing it, I did it with my iBook G4 1.33GHz, and it worked.

indibil, Sorry I haven't had a chance to look at this yet but I plan on doing so this evening.

Just for clarification I have some other questions:
- Have you been able to boot any of the Mac OS 9 lives ISOs yet?
- Are you copying the system folder from the ISO through OSX to your OS9 partition?
- What is the partition size you have installed/are trying to install OS9 on?
- What partition number is your OS9 partition (e.g. the first or second partition)

Hi stewc,

Have you tried applying the following to the NVRAM in Open Firmware, alongside the other commands?

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

This is a fix that allowed some models with an incompatible sound device to boot into OS9. I've never actually tried the sound functionality with this fix on machines that have the incompatible device, so it may be worth a try.
It might not work, and if it breaks things just delete those lines.

Some have reported getting sound working with unsupported Mac Mini models by plugging something into the headphone jack, so that might be an easier solution.

Has anyone managed to get audio working? Following the steps works a treat... just a shame I have to enjoy it in silence...

To make a new authorization by myself I would need to run the IK "Authorization Manager" which in its latest reincarnations won't run on PPC macs. - I'm wondering if the first (?) available version 1.0.7 would run. - Does anybody have this version or earlier laying around? - The oldest I've got myself is 1.0.11 (which doesn't run either.)

It looks like that the one from 2011 runs on PPC: https://web.archive.org/web/20111020034053/http://www.ikmultimedia.com:80/authorizationmanager/system

Yeah. For the authorization I needed to contact the great IK MULTIMEDIA support. - They manually generated an authorization code for me in an hour or so. I really appriciate this company!