I tried to synch it with the cpu before have it running against the wall clock and it capped the cpu to 7mhz, but in the case of a second 68k cpu that issue wouldnt happen. The problem would be have both running in the same core (my chipset emulation takes much core usage, not on load, it seems to be linear, even without load. Didnt digged deeper yet), and synch between core has it quirks