Both in the stations of the "Valle de los Caidos", near Madrid, and in the "Cueva de los Verdes", in Lanzarote, Canary Islands, two sets of data acquisition equipment have been set up that allow for the registration of all the information produced in both stations. Taking into account the special features of both locations, the two systems respond to different building principIes, but their services are mainly similar. In this communication we give a description of both sets of equipment and present the results obtained. 1. DATA ACQUISITION SYSTEM IN THE "VALLE DE LOS CAIDOS" The "Valle de los Caidos" (0401) is a geodynamic station, where permanent observation of earth tides (R. Vieira et al.,1986) has been carried out since 1973; it is located near Madrid, at approximately 50 Km., and is visited by staff from the institute once or twice a week. During these years of research, various instruments have been installed (R. Vieira et al, 1986) and new sensors will be installed in the near future (water-tube, extensometer, vertical pendulum, ...). Taking these characteristics into account, thought was given to developing a new data acquisition system, with the main interest being focused on: low power consumption, thus enabling it to operate during power cuts; it should be portable, given the nature of the entrance to the station; it should be versatile, capable of recording data from a large number of different sensors and of acting upon them; and it should be a system open to possible modifications as a result of experience in its use; for this reason, thought was given controlling the system by computer.