Abstract: An information processing apparatus, for reading information from a memory medium such as a CD-ROM and displaying read information, includes a controller for controlling a drive motor which drives the memory medium. The drive motor is normally driven at a normal speed but is driven at a higher speed when a certain operation requires reading a large amount of information data within a certain time. After the data is read at high speed, the drive motor is automatically switched to normal speed. The drive motor drives at the higher speed only when necessary, so that the drive motor retains its durability and the information processing apparatus is more responsive.

Abstract: In a vehicle control system having a main electronic control unit governing a plurality of subsidiary electronic control units, each of the subsidiary units includes an automatic continuous subsidiary unit self-diagnosis procedure which generates an interrupt signal causing the main electronic control unit to retrieve date and time data from the main unit clock. This subsidiary malfunction date and time data along with details of the subsidiary unit malfunction can be stored in either the main unit memory or the respective subsidiary unit memory for subsequent retrieval and display by an operator via the main control unit. Any malfunction of the main electronic control unit is similarly detected, stored and output by the main control unit for display.