software that enables one computer system (called the host) to behave like another computer system (called the guest) From Wikipedia, the free encyclopedia
An emulator is a computer program or software that makes one kind of computer behave like a different one, so that it can use the same programs or do the same things as the other one. They are best for using old software and games on newer computers. They can be hardware that you add to the computer, or software that you use on it. Some types of emulators require newer computers that have the right system requirements. For example, you need a processor that is fast enough to meet the demands of the emulator. Memory (both RAM and hard drive space) may be another factor to help it run smoothly and more accurately. With the more advanced emulators, if your computer is too old, the emulator or even the operating system may crash[source?].
The simplest type of emulator is called an interpreter, and it runs the foreign program one step at a time. This is the slowest type of emulator but it is easy to debug and port to new platforms. Another type is called the dynamic recompiler, and it takes foreign code a block at a time and recompiles (converts) it into native code. Foreign code that has already been converted is kept, so if the foreign program uses that code again, the emulator does not have to recompile it again. This type of emulator is much faster than the interpreter. Another type is the hypervisor, which only makes slight modifications to the foreign code, and runs it directly on the host processor. The hypervisor requires that the guest (foreign) and host systems use the same type of CPU.
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