| 摘要 |
PURPOSE:To avoid the conflict of subprocessors without increasing hardware nor complicating a program routine by setting an inter-processor communication mailbox in an area to which the common access is possible with those subprocessors. CONSTITUTION:An arithmetic processor 1 serving as a microprogram control type subprocessor, an input/output controller 2 and a main memory 3 containing an inter-processor communication mailbox 30 are connected to a common system bus 100 of a communication control system. The processor 1 reads out a software instruction out of a memory 3 and executes it. If this instruction is equal to an input/output instruction, as instruction is delivered to the designated controller 2. Then the request pointer address registers 13(23) and processing pointer address registers 14(24) are connected to the microprogram real control parts 11(21) of the processor 1 and the controller 2 respectively. Thus the extraction and reset flags of control information are set to the mail box 30 by registers 13, 23, 14 and 24 respectively. |
