Author Topic: Mac OS 9 booting on: PowerBook G4 17" Aluminum 5,1 (Detailed Posts)  (Read 39651 times)

Offline GigaG

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Re: Mac OS 9 booting on: PowerBook G4 17" Aluminum 5,1 (Detailed Posts)
« Reply #75 on: November 19, 2021, 07:22:53 PM »
Update: I'm typing this from the 17" PB G4!

One odd thing nobody has mentioned - there's a high pitched whine that comes from the area near the DC in jack. On OSX, it only happens when the machine is under some loads or scrolling through certain menus, but it's near-constant under OS9. It seems to cease when the trackpad button is active, for whatever reason.
iMac G3 Indigo 500MHz
OS 9.2.2
1GB RAM

Offline robespierre

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Re: Mac OS 9 booting on: PowerBook G4 17" Aluminum 5,1 (Detailed Posts)
« Reply #76 on: November 19, 2021, 08:01:10 PM »
That type of phenomenon is called "microphonics" and can especially affect SMD caps and inductors. The idea is that the component changes size slightly as current passes through it, which is audible if the waveform pulses are at sound frequencies. It can sometimes be cured by judicious use of rubber pads or RTV silicone.

Offline GigaG

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Re: Mac OS 9 booting on: PowerBook G4 17" Aluminum 5,1 (Detailed Posts)
« Reply #77 on: November 21, 2021, 08:58:08 AM »
Is there any way to get external speakers or headphones working on this?
iMac G3 Indigo 500MHz
OS 9.2.2
1GB RAM

 


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