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    Data Processing Systems
    1.
    发明专利
    Data Processing Systems 未知

    公开(公告)号：GB1163859A

    公开(公告)日：1969-09-10

    申请号：GB3442968

    申请日：1968-07-19

    Applicant: IBM

    Inventor： ARULPRAGASAM JEGANANDARAJ AMAL ,  MINSHULL JOHN FRANCIS ,  PINNELL MARTIN COXWELL ,  GLOVER ALAN CHARLES ,  TUFFILL HAROLD WILLIAM ,  WAUGH ROBIN

    IPC: G06F11/14 ,  G06F11/20

    Abstract: 1,163,859. Data processing. INTERNATIONAL BUSINESS MACHINES CORP. 19 July, 1968, No. 34429/68. Heading G4A. In a data processing system, a recovery log unit maintains a profile of a first CPU (central processing unit) updated to a time before error is detected in the first CPU, and detection of error in the first CPU causes a second CPU to process the profile into storable form and store it in common main storage. The profile is all information necessary to permit a cleared CPU to continue its programme where it left off, including information of pending interrupts. Detection of error prevents further updating of the profile, and an error which persists despite instruction retry, or power failure, causes the second CPU to process the profile as stated above. The second CPU has its own recovery log unit and is normally concerned with its own tasks, and when required to process the profile of the other CPU as above, it temporarily stores its own working section in the main storage. The second CPU may take over the tasks of the first, using the profile of the first, in which case it processes its own profile and stores it in the main storage. The first CPU can perform for the second the services which the second is described above as performing for the first, and further CPU's can be provided. A profile can be forced into the system for diagnostic purposes.

    Data Processing Systems
    7.
    发明专利
    Data Processing Systems 未知

    公开(公告)号：GB1168414A

    公开(公告)日：1969-10-22

    申请号：GB3545768

    申请日：1968-07-25

    Applicant: IBM

    Inventor： ARULPRAGASAM JEGANANDARAJ AMAL ,  BINKS DENNIS CRAVEN ,  PINNELL MARTIN COXWELL ,  PRICE RICHARD LOWELL ,  TUFFILL HAROLD WILLIAM ,  VASILE VINCENT CHARLES ,  WAUGH ROBIN

    IPC: G06F11/14 ,  G06F11/20

    Abstract: 1,168,414. Data processing. INTERNATIONAL BUSINESS MACHINES CORP. 25 July, 1968, No. 35457/68. Heading G4A. In a data processing system, recovery log storage is connected via a recovery log buffer to predetermined data locations in a C.P.U. (central processing unit) for recording data therefrom, and is updated after predetermined intervals but only after error checking circuitry in the C.P.U. has indicated error-free data flow in the C.P.U. during the current interval. The output of main storage goes via error-correcting circuitry to both the C.P.U. and a main storage buffer (which holds the 7 latest items from main storage and their addresses). Instruction fetch and execution cycles occur alternately. Changes in various C.P.U. registers during execution cycles are followed by a recovery log buffer the contents of which are passed to the recovery log storage during the respective following fetch cycles except that detection of an error in the C.P.U. during an execution cycle freezes the recovery log buffer, recovery log storage and main storage buffer to permit subsequent resumption of the programme or instruction retry without data loss. The recovery log buffer may be an associative store holding only the new contents of the portions of the C.P.U. registers which have actually changed, together with tags identifying the register portions. The recovery log arrangements, including the main storage buffer, have a separate power supply. Changes in the C.P.U. during fetch cycles may be stored in the recovery log storage during execution cycles.

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