公开(公告)号：US3623018A

公开(公告)日：1971-11-23

申请号：US3623018D

申请日：1969-11-12

Applicant: IBM

Inventor： EVANS JAMES R ,  ROOSSIEN JOHN W

IPC: G06F3/06 ,  G06F17/30 ,  G11C15/00 ,  G11C15/04 ,  G11B13/00

CPC classification number: G06F17/30985 ,  Y10S707/99932

Abstract: A mechanism is disclosed for making complex record searches in random access storage devices. A plurality of parameter values, for example, the department number, age, years of service, are each compared in succession with upper and lower limit parameter values. The parameter values are found in each record by the use of a beginning address of the byte in the record at which the parameter value begins and by a byte count value which is equal to the number of bytes required to define the parameter. A plurality of logical operators associated with each parameter define combinations of parameter tests which must be met in order to satisfy the search criteria.

公开(公告)号：US3348213A

公开(公告)日：1967-10-17

申请号：US44623865

申请日：1965-04-07

Applicant: IBM

Inventor： EVANS JAMES R

IPC: G06F3/06

CPC classification number: G06F3/0601 ,  G06F2003/0692

公开(公告)号：US3585606A

公开(公告)日：1971-06-15

申请号：US3585606D

申请日：1969-09-12

Applicant: IBM

Inventor： EVANS JAMES R ,  ROOSSIEN JOHN W

IPC: G06F12/14 ,  G06F1/00

CPC classification number: G06F12/1441

Abstract: A file protection circuit for disc storage control units prevents unauthorized users from obtaining information from a bulk disc storage unit. Each transfer from the sequentially addressable buffer within the storage control unit is monitored so as to determine whether the data sought from the sequentially addressable buffer is from a protected field. Upon determining that the data is from a protected field, the data transfer from the sequentially addressable buffer to the main memory of the data processor is prevented. The subsequent data transfers are counted by a counting mechanism so as to prevent the transfer of a predetermined number of bytes or characters. When the counting means reaches a predetermined value, the blocking mechanism is inhibited and further transfers from the sequentially addressable buffer to the main memory are allowed.

公开(公告)号：US3435418A

公开(公告)日：1969-03-25

申请号：US3435418D

申请日：1965-05-27

Applicant: IBM

Inventor： EVANS JAMES R ,  ROWE THOMAS H

IPC: G06F9/46 ,  G06F17/30 ,  G11B13/00 ,  G11B5/00 ,  G11C15/00

CPC classification number: G06F9/52 ,  G06F17/30168 ,  Y10S707/99931

公开(公告)号：US3408631A

公开(公告)日：1968-10-29

申请号：US53799866

申请日：1966-03-28

Applicant: IBM

Inventor： EVANS JAMES R ,  JONES ROBERT A

IPC: G06F17/30 ,  G11B20/12

CPC classification number: G06F17/30985 ,  G11B20/1252 ,  Y10S707/99931

公开(公告)号：US3299410A

公开(公告)日：1967-01-17

申请号：US35474064

申请日：1964-03-25

Applicant: IBM

Inventor： EVANS JAMES R

IPC: G06F3/06 ,  G11B20/12

CPC classification number: G11B20/1252 ,  G06F3/0607 ,  G06F3/0638 ,  G06F3/0676

公开(公告)号：US3219979A

公开(公告)日：1965-11-23

申请号：US1643460

申请日：1960-03-21

Applicant: IBM

Inventor： STEPHEN BESPALKO ,  EVANS JAMES R ,  KLOTZ RAYMOND J

IPC: G06F13/16

CPC classification number: G06F13/16

公开(公告)号：CA783230A

公开(公告)日：1968-04-16

申请号：CA783230D

Applicant: IBM

Inventor： EVANS JAMES R ,  ROWE THOMAS H

公开(公告)号：CA918812A

公开(公告)日：1973-01-09

申请号：CA91285

申请日：1970-08-21

Applicant: IBM

Inventor： ROOSSIEN JOHN W ,  EVANS JAMES R

IPC: G06F12/14

公开(公告)号：CA763626A

公开(公告)日：1967-07-18

申请号：CA763626D

Applicant: IBM

Inventor： EVANS JAMES R