Abstract: A processing method for automatically recording caller's message in a cellular telephone is mainly used to answer a telephone call automatically when a cellular telephone user is busy. The method chooses a proper host welcome message to answer the caller to let him understand why the user cannot answer the telephone call by himself and ask the caller to leave a message in the telephone through a situation modes established by the user. The user can record automatic answering speech beforehand in a situation mode establishment item and establish processing modes after answering the telephone automatically. Thereby, the caller can understand why a phone call is refused to answer and the user can save a telephone fee.

Abstract: A parallel bus system for enabling the addition of peripheral devices includes a central processing unit, at least one peripheral device, and a parallel bus for connecting the central processing unit and the at least one peripheral device. One line of the parallel bus is used as the peripheral device selecting line, and another line of the parallel bus is used as the system clock line. Other lines of the parallel bus are lines to form one byte of the system. The messages flowing on the other lines include instruction bytes, address bytes, and data bytes. In general, instruction bytes are first to be put on the other lines, followed by address bytes, and then data bytes.