Was it Turing complete? Because Zuse&#x27;s Z3 was.<p>I&#x27;m not saying though, that this is a criteria for calling any machine a computer. But it&#x27;s probably what sets Zuse&#x27;s achievement apart.<p>UPDATE: I&#x27;ve just learned that Babbage&#x27;s language was also Turing complete. So Zuse&#x27;s achievement is solely having physically built the first working computer, while Babbage&#x27;s machine was never realized.