PURPOSE: To execute prior processing of a designated I/O and to prevent competition with other programs by providing a channel device with an I/O designation register, a matching circuit and a matching validity designating register.
CONSTITUTION: When an end report from a designated I/O 9-1 is inputted to a data channel 4, the end report is stored in a channel status storing area 8 through the matching circuit 3 and an interruption information FF6 is set up. Consequently, a central control processor 5 detects the end report from the I/O 9-1. If a termination report is generated from an I/O 9-n other than the designated one, the circuit 3 is unmatched, the termination report is not stored in the storage area 8 and the FF6 also is not set up. Therefore, the processor 5 sends a waiting signal to the I/O 9-n to wait the end report. Consequently, the designated I/O 9-1 can be processed with priority and competition with other programs can be prevented.
| JPH03202944 | INPUT/OUTPUT INTERFACE CONTROL SYSTEM |
| JPH03141451 | DATA INPUT/OUTPUT DEVICE |
OOTSU YOSHIKATSU
OOMA TOSHIO
