CSIRAC is perhaps, the least well-known of the very early stored-program computers. Designed by Trevor Pearcy in Australia, it ran its first program in November 1949 and is reckoned to be the fifth electronic stored-program computer in the world and, since it has long since outlived its contemporaries, is certainly the oldest surviving such machine.

CSIRAC is on display at the Scienceworks Museum in Melbourne albeit not in an operable condition. It is understood that the extent of renovation which would be required to make it work in a safe manner would detract from its authenticity.

to a set of web pages in which may be found an emulator for CSIRAC developed by Bill Purvis. The emulator is written in the Java language and is availabe in source form. It is known to operate under Windows, Linux and OSX.