The Replay runs currently A T68K core, which is based on a *Compatible 68000 cpu.
*”Compatible” means that most of byte and word Instructions are cycle exact but many other Instructions are faster.
*”Adapted” means that the synchronous Mode, and some bus control signals and the FC Out are missing.
The Replay is currently also in the process of moving to a new 68K core of its own, and as such, it will become cycle accurate, and further more, it will also then be able to run demos such as Anarchy 3D demo II and other Amiga games that prior to this would not run, plus other Cores such as AtariST where yes cycle timing etc needs to be exact will also be changed where currently this has been a problem.