A geological data logger

A novel data logger has been designed and tested for logging data from a satellite navigator, magnetometer, and a deep-sea echosounder. The logger exploits the interrupt structure of an in-house 8085 single-board computer (SBC) to service requests from the satellite navigator and real-time clock chip. The real-time clock interrupt forces the 8085 central processing unit (CPU) to fetch data from the magnetometer and echosounder at a user-selected interval. At present, up to four days of data can be stored on a single DC-100 tape cartridge. All recorded data are displayed on a dumb CRT terminal. The data-logging software is written in PLM/85-a higher level language for the 8085 microprocessor.