DYNAMIC PERIPHERAL DEVICE ADDRESS ASSIGNMENT METHOD AND UNIT

    公开(公告)号:DE3166311D1

    公开(公告)日:1984-10-31

    申请号:DE3166311

    申请日:1981-06-25

    Applicant: IBM

    Abstract: A peripheral device address assignment mechanism is described which does not require the use of plugboards or jumpers. This mechanism enables a host processor to select any desired peripheral device and set its device address to any desired value at any desired time. This is accomplished by providing each peripheral device control unit with a loadable device address register for holding the device address assigned to its peripheral device. Each device control unit is further provided with circuitry responsive to the appearance of a unique I/O command on the processor I/O bus and to the activation of a unique set of the I/O bus data lines by the processor for loading into its device address register the desired device address value as supplied thereto by the processor via the I/O bus.

    6.
    发明专利
    未知

    公开(公告)号:DE2230119A1

    公开(公告)日:1973-01-25

    申请号:DE2230119

    申请日:1972-06-21

    Applicant: IBM

    Abstract: An event detector for providing signals to general purpose digital computer hardware and/or software when excessive time passes prior to event occurrence. The detector includes storage means to record pluralities of sensitive events together with a time by which the event must be completed and clocking and comparator means to calculate target times and detect overruns.

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