The cross-jargon interface is shown in the diagram on the bold title line with the arrows. In this example it created a software industry.

     The existence of software, which we take for granted, depends on an important invention: the instruction set, a language whose expressions, called programs, could be stored in the computer’s memory so that the computer would read and be controlled by them. This idea, invented by the mathematician John von Neumann, looks minor, but it created a software industry. Before, digital computers were programmed with switches and wiring panels by small numbers of people familiar with the hardware.

     This invention also requires a technical substrate not shown: a computer with a memory that can store, fetch, and interpret the instructions in this memory.

     In Example 2 we’ll take this model of innovation and transplant it to a different pair of communities.