Abstract: This invention is composed of detecting means for detecting operating condition of a vehicle, operation data recording device loaded on a vehicle for arithmetic processing detected data to write into external memory unit, and external data processing device (external computer) for processing data stored in external memory unit. And of data detected by the detecting means, numeral value data such as speed, engine r.p.m. or the like are displayed to external display device, and operation or non-operation data are processed arithmetic to data for memorizing at arithmetic processing portion to be written into external memory unit.While, data obtained from other than detecting means are input by external input portion of the operation data recording device to be written into external memory unit.Thus input data and parameter stored in inner memory is enabled to accesse and to debug at any time through connector for maintenance.

Abstract: This invention provides a system for recording operation data of a machine, wherein a program for converting signals stored through a sensor or measuring means into operation data in conformity with the increase or alteration of the sensor or measuring means due to the operation status of the machine or to the type of the component of the machine is preliminarily stored in one or separate card-type external memory or other transportable external memory. The terminal of the system is designed to allow an connection of various kinds of the sensor or measuring means. Accordingly, it is possible to conduct processing and recording of various kinds of operation data by exchanging the external memory stored with a prescribed operation data-processing program, or by changing the writing of the program. It is also possible to record operation data in the external memory stored with the operation data-processing program after the program is read out to simplify the operation of an operator.