Possible Duplicate:
Simulator or Emulator? What is the difference?
In simple understandable terms, what is the difference between the two terms?
(Using as an example your first link)
You want to duplicate the behavior of an old HP calculator, there are two options:
This is a Simulator, When You write new program that draws the calculator's display and keys, and when the user clicks on the keys, your programs does what the old calculator did.
This is an Emulator, When You get a dump of the calculator's firmware, then write a program that loads the firmware and interprets it the same way the microprocessor in the calculator did.
