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The COBLOC programming system was written to enable all-digital simulation of the operation of large mode-controlled hybrid computers. The COBLOC programming language is block-oriented and is easily learned, even by those without prior analog or digital computer programming experience. The inclusion of patchable logic simulation in COBLOC has extended the application of digital simulation techniques to a greater variety of problems. Results are presented as graphic outputs, in addition to tabular outputs, for convenient analysis of results. The features of the COBLOC programming system that contribute to its usefulness in simulating the operation of a hybrid computer are described. A brief summary of the internal operation of the COBLOC compiler is included. COBLOC was written for the CDC 1604 and 3600 computers and has been used in the solution of a wide variety of problems of varying complexity. COBLOC and similar programs have significant value in generating check solutions and information for scaling for studies to be conducted on hybrid computers, as well as being satisfactory substitutes for hybrid computation in many simulations.