Processor question

[Zac67]

You can't keep _RST high as the driver pulling it down would be overstressed or even burn out.
I guess they use/mimic some bus request/bus grant stuff to get the 68k out. The '030 requests the bus and just never gives it back. (In contrast to other architectures the M68k itself is fully DMA capable since it is possible to arbitrate for the bus.)

Making use of both CPUs would imply SMP logic in both OS and system/turbo board, which simply isn't there. Running a PPC concurrently is somewhat different as it has an OS of its own, nothing that would be called SMP.

[Zac67]

W/o large caches there's not much point in putting two CPUs on the same bus, they'd be waiting for RAM access most of the time. An '040/060 dual system with (separate) cache(s) would be something different though. Makes me think of Dave's Gemini research, which had never been able to run AmigaOS afaik.