Abstract
Creating an emulator to run old programs is a difficult task. You need a thorough understanding of the target hardware and the correct functioning of the original programs that the emulator is to execute. In addition to being functionally correct, the emulator must hit a performance target of running the programs at their original realtime speed. Reaching these goals inevitably requires a considerable amount of debugging. The bugs are often subtle errors in the emulator itself but could also be a misunderstanding of the target hardware or an actual known bug in the original program. (It is also possible the binary data for the original program has become subtly corrupted or is not the version expected.) Solving these problems requires some unusual debugging techniques.
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