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    DATA PROCESSING SYSTEM
    1.
    发明专利
    DATA PROCESSING SYSTEM 未知

    公开(公告)号：GB1243619A

    公开(公告)日：1971-08-25

    申请号：GB2336770

    申请日：1970-05-14

    Applicant: IBM

    Inventor： HEYDEN HORST VON DER ,  HARTWICH REINHARD ,  LAMPE HANS HERMANN ,  REICHL LEOPOLD

    IPC: G06F11/00 ,  G06F13/00 ,  G06F13/42

    Abstract: 1,243,619. Data processing. INTERNATIONAL BUSINESS MACHINES CORP. 14 May, 1970 [27 June, 1969], No. 23367/70. Heading G4A. A data processing system comprises a CPU connected (e.g. by a ring bus) to a plurality of ancillary units (e.g. I/O control units or other CPU's), each of which includes means to generate a unit selected signal when it correctly or falsely responds to an address signal received from the CPU, there being means to generate a warning signal if two or more of the ancillary units generate unit selected signals in response to the same address signal. A unit selected signal is generated if an address bus portion of the ring bus has the address of the unit on it and at least one bit on a data bus portion of the ring bus is 1. The unit selected signal is ORed on to a line of the ring bus, and if the incoming portion of this line at any unit producing a unit selected signal already has such a signal on it, a warning signal is ORed on to another line of the ring bus. The CPU responds to the warning signal causing each unit producing a unit selected signal to identify itself to the CPU by a signal on a respective line.

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