  The advent of microcomputers in the 1970s has dramatically changed our
society. Since then, microprocessors have been made almost exclusively from
silicon, but the ever-increasing demand for higher integration density and
speed, lower power consumption and better integrability with everyday goods has
prompted the search for alternatives. Germanium and III-V compound
semiconductors are being considered promising candidates for future
high-performance processor generations and chips based on thin-film plastic
technology or carbon nanotubes could allow for embedding electronic
intelligence into arbitrary objects for the Internet-of-Things. Here, we
present a 1-bit implementation of a microprocessor using a two-dimensional
semiconductor - molybdenum disulfide. The device can execute user-defined
programs stored in an external memory, perform logical operations and
communicate with its periphery. Importantly, our 1-bit design is readily
scalable to multi-bit data. The device consists of 115 transistors and
constitutes the most complex circuitry so far made from a two-dimensional
material.
