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*Almost* Fastest PowerBook ever, and more to go.

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On 7/21/2018 at 6:25 PM, MOS8_030 said:


I worked at Freescale qualifying the 7448.  (And the 7447, 7450/55, 7410)

Apple kept Freescale on the hook for the 7448 right up to the bitter end, stringing FS along having them believe Apple was going to use the 7448.


At one point I was corresponding via email with an Apple engineer trying to get a firmware update for the P58 mobo's so I could run the Apple test suite and OSX with the 7448.

My email got forwarded to about three other people within Apple because they had already pulled the resources from the team that maintained their PPC test suite.

One of the Apple recipients replied with something like "Why do we need this? We're not using A8 (Apollo 8 ) and hit reply all so I was copied too.


My phone rang literally about 30 seconds after I received the email. It was the Apple engineer I had been corresponding with hastening to explain that I should ignore this particular reply and they were working to get me the firmware update I asked for.

I did get the OF update about three days later and about two weeks later FS got the "official" word that Apple would not be using the 7448. 

(Even though despite Apple's efforts it was apparent to FS long before that Apple wasn't going to use the A8. )


Anyway, I have some photos of the P58 (G4 MDD) test rigs I used at work. I should dig those out. They're hardly proprietary now.



thats some very cool information!


id be very interested in seeing pictures of the whole setup, its interesting how you used MDDs as test beds, im guessing Motorola made up custom CPU cards for the 7448s 360CBGA foot print? (as the stock MDDs use 7455s which are 483 CBGA packages)


im very interested in hearing your stories as I have been doing a lot of work and research into PowerPC CPUs and upgrading various Macs with faster ones :)


which you can read about here 

I also have a few posts on Mac Rumors about my PPC CPU Upgrading adventures :)












I also helped dosdude1 with his iMac G4 upgrade project https://forums.macrumors.com/threads/worlds-fastest-imac-g4-2-ghz-imac-g4-cpu-upgrade.2125765/


BTW do you happen to have any Schematics for Apple desktop machines?


I have quite a few PowerPC Laptop schematics but nothing for Apple desktop machines or CPU cards (the only desktop schematics I have are for iMac G4s and iMac G5s 


I would love to get some as it would help imensly with my research and upgrade projects :)

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Yes, Motorola had their own daughter cards. They used a socket that could accept a BGA part.

I have some photos of the card we used with the P58 motherboards on my other computer, I'm out of town right now.

Here's a photo of two systems I set up to do accelerated life testing with the 7448.

I cranked up the voltage and the temperature and and ran the parts non stop for about three months to induce voltage threshold shifts.



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thats so Awesome to see :)


did you have to run a Custom build of OS X along-side the custom Mobo FW when testing the 7448 CPUs? because AFAIK no version of OS X has native 7448 CPU


(CPU Upgrade companies who sold 7448 upgrades for PMs got around this via either Firmware patches that masked the 7448 as a 7455, or via a special NVRAM patch)


we used the NVRAM patch for when we fitted the 7448 CPU to the 7445 iMac, as the Firmware patch we used to get the machine to POST with the 7448 CPU, only removes the Halt on unknown CPU thing apple has, it does not patch anything else, so to get OS X to boot on the 7448 we had to use the NVRAM patch from one of the CPU upgrade companies.


also out of sheer curiosity and research etc, do you have the Custom Firmware apple provided that let the MDDs Boot with the 7448 CPUs? I would love to play with that :) also reading the Schematics for the DLSD PowerBooks I had theorised that they where going to use 7448s but switched back to 7447Bs at the 11th hour, its pretty cool to see that I was indeed on the right path, but I wonder do you think the DLSD still has 7448 support in Firmware? (I know New world ROM PowerPC macs will Halt on POST if they detect a CPU with an unknown PVR otherwise)


I just wanted to say again how awesome this all is


im quite passionate about PowerPC (Apple) stuff esp the very technical side of things, so this is just beyond awesome and I cant wait to see more :) 


thank you very much for sharing what you have

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