12 inch PowerBook G4 still going strong! : r/VintageApple
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How to upgrade RAM in your Apple iBook G4 - YouTube
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1GB Memory RAM Upgrade for Apple PowerBook G4 (1.33GHz 15-inch) Laptops | eBay
1GB RAM Memory for Apple PowerBook G4 M9690LL/A (1.5Ghz 12-inch) Black Diamond Memory Module DDR SO-DIMM 200pin PC2700 333MHz Upgrade System Specific Memory - Newegg.com
How to upgrade RAM in your Apple iBook G4 - YouTube
My PowerBook G4 12" Journal - Full tear down, SSD upgrade and CPU Fan. | MacRumors Forums
PowerBook G4 | 1.5 GHz | 15 Inch | SMS/BT2 - AI - Techable.com