portable 68000 emulator

In comparison to other emulators this one doesn't gives you the complete instruction cycle count but the consumed cycles more times per instruction.
By each memory access during the instruction you have knowledge about how many cycles have passed so far. So you could sync up your other concurrent tasks before accessing system bus

portable68k will no longer be continued as an individual project due to time constraints. This does not mean that there is no further development. I am constantly developing the 68k emulation as part of the project "Denise (C64/Amiga emulator)". The programming is independent of the parent project "Denise" and can be transferred to a completely different project without additional programming effort.
If you are interested in this 68k emulator, I make it available under the MIT license. If another license suits your project better, we can arrange it.