The addition of a microcomputer to a standard multichannel engineering seismograph provides a seismic processing system with enhanced processing capabilities. The resulting system is low-cost and has widespread engineering applications. Developments described in the report include a low-cost logging unit for recording data from the seismograph, an interface card for interfacing the microcomputer to either the logging unit or the seismograph, and a modular software package which provides interactive time- and frequency-domain seismic processing