Researchers at the University of Manchester and elsewhere built computers which implemented dataflow at the hardware level. The main reason we don't have the

Researchers at the University of Manchester and elsewhere built computers which implemented dataflow at the hardware level. The main reason we don't have them is because of Moore's Law: wait a few years and a single CPU will be just as fast as multiple dataflow CPUs. There are historical reasons why we're programming in text in mostly imperative languages: graphics terminals were either not very good or very expensive, and computers had single CPUs, until quite recently.