cycle exact emulator
http://en.wikipedia.org/wiki/Computer_architecture_simulator
http://www.youtube.com/watch?v=kICPVZDyx30
includes unit tests for almost all opcodes (*)
- cycle usage callback for each single step
- starts prefetching at correct cycle times (**)
- starts irq sampling at correct cycle times (**)
- accurate exception processing (***)
(*) unit test samples were generated with amiga
(**) information is taken from patent and manual, not proven with logic
analyzer
(***) needs more testing
http://sourceforge.net/projects/portable68000/
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