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This paper contains a description of the architecture of the fast digital processor (FDP), a general purpose digital attachment to a UNIVAC 1219 computer facility. The main purpose of the FDP is to enhance the capability of the UNIVAC facility for performance of digital signal processing operations such as digital filtering and discrete Fourier transforms. The structural design evolved during a series of discussions among the four authors. The FDP is presently being constructed under the supervision of one of the authors, P. McHugh, and should be completed in late 1970.