I own a PowerBook G4 A1104 with 512 mb of ram and 1.5 ghz and I also own an Ibook G4 1.33 Ghz 512 ram. I have seen videos on youtube of people turning their ibook g4 and imac g4 into machines running from Yosemite to Sierra.

How can I accomplish this?

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    Can you add a link to these videos? I‘m curios how people get a G4 to execute code compiled for Intel processors :-) – nohillside Mar 2 '18 at 15:19
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    & to execute it inside 512MB RAM... & fast enough to be able to tell it's even actually running... – Tetsujin Mar 2 '18 at 15:20
  • It might be possible to put a small Intel board into a PowerBook/iBook and install macOS on it though... – nohillside Mar 2 '18 at 15:22
  • They're Hackintoshes. The video itself references to the build video and instructions. – Allan Mar 2 '18 at 15:56

Your Mac uses the PowerPC processor. Yosemite and Sierra require an Intel x64 compatible processor. So a software modification not practically possible. I can not directly answer the question regarding whether a hardware modification can be made. Although, I can say that usually such modifications require reusing the existing logical board, RAM and peripherals. The existing logic board, RAM and peripherals will be to slow for Yosemite and Sierra. Furthermore the video will not support the higher resolutions required by Yosemite and Sierra.

If you want to choose a current operating system, try Ubuntu (Lubuntu) or some other linux distro.

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