公开(公告)号：DE3787833D1

公开(公告)日：1993-11-25

申请号：DE3787833

申请日：1987-05-19

Applicant: IBM

Inventor： COLLINS ROBERT WILLIAM ,  DAVIDSON WILIAM SIMPSON ,  DICKES STEVEN MICHAEL ,  EFFLE JAMES SCOTT ,  LARSON CARLE JOHN ,  WEINSCHENK RUSSELL JOHN

IPC: G06F11/14

Abstract: A recovery mechanism restarts jobs following correction of a system failure and automatically marks the jobs for interruption at a logical boundary. The logical boundary is above logical file updating functions such that logical files are in a known state when jobs reach the boundary. When a system failure is detected which has not yet resulted in lost data, an image of working memory, including hardware status is saved on nonvolatile storage. After the failure has been resolved, the system is initially loaded with operating programs (IPL) and working memory is reloaded from the nonvolatile storage. All jobs which were reloaded are marked for interrupt at a machine instruction boundary, and processing is started. After all jobs have reached the boundary, or a predetermined time has elapsed, processing is stopped and the system is re-IPLed. There are few system index recoveries to be performed, since most jobs reached a point where logical files were synchronized with corresponding data.

公开(公告)号：DE2408828A1

公开(公告)日：1974-09-26

申请号：DE2408828

申请日：1974-02-23

Applicant: IBM

Inventor： KLINE NORMAN DAVID ,  WEINSCHENK RUSSELL JOHN

IPC: G03G15/05 ,  B06B1/02 ,  B41J2/02 ,  B41J2/045 ,  B41J2/055 ,  G06K15/10 ,  H03K17/73 ,  H04N1/23 ,  B06B1/06 ,  H02M1/08

Abstract: A high voltage crystal driver is operated by a control pulse having a predetermined repetition rate which fires a first singleshot multivibrator to turn on a first silicon controlled rectifier (SCR) to charge the crystal. A resistor in the anode circuit of the SCR limits the dv/dt and sets the maximum current in the first SCR. The pulse width of the control pulse is greater than the period of the first singleshot multivibrator and the fall of the control pulse is used to fire a second singleshot multivibrator which turns on a second SCR to provide a discharge path for the crystal. A resistor connected in the anode circuit of the second SCR limits the current therein and the dv/dt.