I've seen quite a few mods for using a 2006-2008 Blackbook case to accomodate a 5,1 or 5,2 motherboard - that was always something I'd wanted to try doing but just never that the time or energy to devote to it. They do look really nice though.
On the subject of the 4,1 A1181 MacBook I was really disappointed when Apple decided to stick with the GMA X3100, and not go with the far more powerful GMA X4500MHD, which was supposed to provide double the performance. I doubt it's capability would have come close enough to the GeForce 8800m GT in the MacBook Pro to threaten its "pro" status. As with many Apple decisions, it was likely to keep costs low and margins high.
It was to be expected that Apple base 'iPhoneOS' on OS X rather than create a new OS from scratch.
There was actually a team lead by Tony Fadall that would have created an OS for the iPhone based on the iPod. I personally don't think that would have been successful in the long run as iOS turned out to be, but it's definitely food for thought.
As for Apple's experience in designing chips, the early SoCs for devices like the original iPhone and iPod touch were manufactured by Samsung, but to Apple's specs. It's likely Apple got the start of its experience in SoC design from it's work with Samsung around this time, and PortalPlayer before them.
They
did, but arguably, they passed on it.
IBM announced the 64-bit POWER3
two weeks before Motorola
announced the 32-bit PPC7400. Both were designed around the PowerPC ISA.
I would think that Apple passed on the POWER3 for the same reason they passed on the PPC 620; it ran too hot and consumed too much power for the thin and light/portable products they wanted to make. (Plus it was never intended for consumer-level computing products.)
Perhaps Apple would have used it in a product like the Xserve or the Apple Workgroup Server, but who knows if there would have been a sustainable market for it back then?
[An amusing thing is IBM added Motorola’s AltiVec to their PPC750 plans, but ultimately never implemented them, at least in whole, for a finished chip product.]
Ah yes, "Mojave", the rumored cancelled
PPC750VX. According to
very dubious sources it was supposed to clock at 1.0-1.4 Ghz+ and would have wound up in the iBook (and possibly the iMac?) - the only problem is that by the time the design work had started Apple had already decided to transition both the iBook and the iMac to the G4.
Of all of the PPC vapourware projects that I've seen (one person once spoke of a hybrid IBM PPC CPU that would have had the core of a 604 side-by-side with an x86 core!), that 750 derivative was one of the most tantalizing, as it seemed like it was actually technically plausible. I wonder how it would have stacked up against the 7455, the 7457, or the Pentium M CPUs of the day.