>how is possible to run 68k code on PPC?
OS4 (and Morphos) do have 68K code translation buildin, these OS’s translate 68K instructions to Powerpc on the fly.
And (almost more importantly) PowerPC can use same byteorder as 68k - big-endian - so any data written by PowerPC programs can also be read by 68k programs and vice versa - 68k and PowerPC can share data without any obstacles. This is _not_ true for x86, which is little-endian. With x86, special measures needs to be taken (byte-order swapping on _all_ read and write to RAM) before data can be shared between x86 and 68k programs. ARM processors have historically been similar as PowerPC, in the they can run in both little-endian and big-endian mode, but lately both PowerPC and ARM have been moving towards "x86 compatibility" and little-endian. ARM still has a big-endian mode for all data though (but not instructions), and hence can in principle be able to provide a better integrated 68k emulation than x86.