...think outside of the box enough to realise that an ARM SoC many times more power than the fastest m68k Amiga could just emulate the whole thing
Rasberry Pi can only emulate basic A500 because pi operates at the speed of 200...300Mhz Pentium PC.
Other than that...
>I think it would be really cool to create a bridgeboard that plugs into the raspberry PI...
Absolutely futile.
But there are already implementations where RPi simulates A500 FDD or ethernet card.
A lot of stuff can be done with simple RPi-A500 adaptation. No Jens needed, just DIY soldering + load of SW work.
>Maybe even emulate a powerpc chip.
RPi should be able to emulate PowerPC @ 20Mhz speed or so.
For ARM deviced, AEROS or ARIX for 1.7Ghz ODROID might be damn usefull.
For Jens to do:
-FPGA card (PCIe client) to do AGA+more emulation
-FPGA card (PCIe host) to do 68k+more emulation
-Passive backplane to house those two and perhaps to provide a few more PCIe slots
-parts to built that into ATX or DTX case