Install older OS X onto an external drive. It is designed to take advantage of all the latest Mac OS X technologies, like.
MAME OS X is a native Mac OS X port of the popular MAME emulator.This is an extensive list of my known Macintosh system emulators: Mini vMac. MacOS and MacOS X are not that compatible, so if you need to run old MacOS programs or files then you need an MacOS emulator. Before the current OS for Apple systems (MacOS X), there were earliest OS versions that were simply know as MacOS.
Note: On Mac OS X, the B2G emulator requires a Core 2 Duo processor or later that is, a system that is compatible with Mac OS X 10.7 'Lion.' You do not actually have to be running Lion, you just have to be compatible with it.
