FIELD: portable electronic device used as auxiliary memory device. SUBSTANCE: system has driving unit capable of program starting and execution and slave unit incorporating interface for coupling with driving unit; driving unit has control device used to transfer information accompanying program starting to slave unit and to read information out of slave unit; slave unit has program memory device that holds the programs, program starting and execution device, and memory device holding information that characterizes appearance of various events. EFFECT: provision for using portable electronic device as off-line slave unit. 12 cl, 31 dwg, 10 tbl
