A microprocessor controlled time code generator for an OBS system.
Hideki Inatani, Itsuo Furuya · Journal of Physics of the Earth · 1980
A very compact time code generator is designed for an OBS system and portable observing system with battery power supply. By use of a microprocessor it is constructed without any hardware counter or any shift register. All the process of a time code generator is realized by software, and the CPU clock is the sole timing unit. The program is stored in 256 byte memory.