Digital Analog Simulation (DAS) is a programming technique which makes a digital computer operate much like an analog computer. The application of the technique to programming an IBM 7090 computer is described. Although it is not intended primarily as an analog computer simulator, the similarity of DAS programming to analog programming is readily apparent. DAS combines remarkable ease and speed of programming with reasonably high computing speed. The DAS input language is designed to permit a simple and concise description of an analog-style block diagram of the problem to be solved. The blocks in the diagram are restricted to summers, integrators, multipliers, limiters, relays and other "components" for which macro-instructions appear in the DAS compiler. The construction of a DAS block diagram is more straight-forward than an analog computer block diagram because there is virtually no restriction on the number of available components, and because no amplitude scaling is required. The standard output format provides a complete record of the problem by printing the entire input program and all input data. This is followed by a multiple column table of sequential values of the desired output quantities. These columns of data serve the same purpose as the recording channels of a conventional analog computer output device in that each column provides a complete history of one variable.