Portable terminal device for communicating with vehicle mounted equipment

摘要

A portable terminal device ( 100 ) comprising a microcomputer ( 2 ) and a memory card ( 5 ) is mounted on a vehicle for collecting operation information of the vehicle. The microcomputer ( 2 ) has a flash read only memory ( 23 ) storing a firmware of the terminal device ( 100 ), and a memory card slot ( 6 ). The memory card ( 5 ) comprises a firmware layer ( 5 a) storing a second firmware and a data storage layer ( 5 c) for recording the operating information. The microcomputer ( 2 ) replaces the firmware in the flash read only memory ( 23 ) with the second firmware, thereby rendering the firmware replacement easy.