@rdolores
It is interesting to note that the guy who made JIT was Bernd Meyer. His JIT code has not only been used for 680x0 emulation for the Amiga on UAE (WinUAE, E-UAE, etc.), MorphOS and OS4, but also for the BasiliskII Mac emulator.
Neither MorphOS or OS4 use Bernd's JIT.
MorphOS JIT (called "Trance") was written by Ralph Schmidt and Teemu Suikki. Some minor work on it has been made by other MorphOS Team members: Mark Olsen, Sigbjørn Skjæret, and myself.
OS4 JIT (called "Petunia") was written by Álmos Rajnai.