| 摘要 |
PURPOSE:To eliminate useless data transfer between a host computer and a communication controlling mechanism by making the host computer prepare WRITE command and transmission data and give an input/output start instruction to the communication controlling mechanism. CONSTITUTION:A channel process interface controlling section 5 receives a start I/O instruction (IOS) from the host computer 1 and makes an interruption request to the computer 1. An input/output interface controlling section 8 gives an input/output request and controls data transfer. When transmitting data, the computer 1 prepares WRITE command and data and gives the SIO instruction to the communication controlling mechanism 2. On receiving the SIO instruction, the controlling mechanism 2 reads the WRITE command and performs necessary processing, and divides data designated by the WRITE command into units of segment and transmits to a terminal through a communication circuit 4. |
