| 摘要 |
PURPOSE:To attain efficient use of bus by utilizing a bus not in use so as to attain data transfer between a cache memory and a disk driving device. CONSTITUTION:When no input/output instruction exsits from channels A12a, B12b respectively, directors A14a, B14b refer respectively interruption latches 20a, 20b and when interruption exists, a head flag being set in a flag register 24 is searched, control information thereto is extracted and the data loading and reloading processing are started. Then, the data load processing to a cache memory 17 and the data reload processing from a cache memory 17 to a disk driving device 18 are executed by both directors when no input/output instruction exists by both directors by providing a load cue memory 15 between both directors. |
