| 摘要 |
PURPOSE:To decrease the number of program steps of each processor which performs the input/output control, by using a channel adaptor to secure the correspondence between the subchannel address received from a channel and the corresponding processor. CONSTITUTION:A channel adaptor 4 compares a device address received from a channel 2 with a subchannel address corresponding to each processor via a comparator 21. Then a microprocessor 23 secures the correspondence between the coincident subchannel address and its corresponding processor. An input/ output instruction produced from each processor functions to store the input/ output address word transferred by said input/output instruction temporarily into an input/output address word register 25. Then the processor 23 decides whether the preceding input/output instruction is being executed or not. If so, the input/output instruction is held and the register 25 is read after said instruction is executed. Then the next input/output instruction is executed. Thus the number of program steps can be decreased for the input/output procedure of each processor 6. |
