A method and system for managing a telephony connection on hold to reduce the use of resources within the telephony network andor to allow the user on hold to place their telephony device into an on-hook state after they have been placed on hold. The storage apparatus is provided with a light source for emitting the light beam, and a control section for controlling a power L2 of the light beam in a vicinity of a start of the recording field to become higher than a power L3 at the data field of the recording field. In this state, the information processor continues to collect information about traffic state and, when it is determined that over-traffic state has terminated, starts to transfer an interrupt request to the data processing block and makes the communication processing function recover. A low-voltage high-swing Max WTA circuit is also provided. The fresh air quantity reference value setting means sets the reference value in accordance with not only the operating state of the engine but also a target adjustment amount set for the exhaust flow rate adjusting means by target adjustment setting means. The communication bus comprises a bus controller for receiving memory access request data associated with a first memory access to a first location in the memory by a first one of the peripheral devices and transferring the received memory access request data to at least one memory address pin used to access the memory.