@projectgus That looks like a NuBus card - possibly an upgrade card for an older 68k Mac? Then it's probably more something like some custom glue logic thing, and not a CPU in whichever form.
@galaxis it is indeed for upgrading a 68k Mac to a PowerPC. You're probably right, I'm just wondering why it has an ARM logo on it.
@projectgus Maybe designed by ARM, produced by VLSI?
An earlier prototype has much the same chips, but no big ARM logo.
I think VLSI were the first ARM licensee - there could be an ARM in there, and given the label, I think there must be. Perhaps needed to setup the board for the PPC to boot.
@projectgus @EdS According to https://web.archive.org/web/20020817155956/http://docs.info.apple.com/article.html?artnum=16722 it was possible to switch between the PPC and the m68k CPU with a reboot, so there must have been some pre-boot toggle to decide which CPU to power up - can't have been both on the bus.
The MacWorld image designates the chip as "040 bus adapter and cache controller", which sounds plausible (the card seems to have brought a Mac PPC ROM, but had to talk to memory and periphereals over the 68040 CPU bus).
From Twitter comes a few clues:
Apple not the designer for these, Daystar.
A "real" PowerMac 6100 of the same era has no VLSI chips at all. https://images.esellerpro.com/2131/I/542/07/POWERMAC6100%20001.jpg …
Similar era 68K Macs have lots of VLSI chips but nothing marked ARM.
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