GB1389066A - Method for controlling digital data processing systems - Google Patents

Method for controlling digital data processing systems

Info

Publication number
GB1389066A
GB1389066A GB1218372A GB1218372A GB1389066A GB 1389066 A GB1389066 A GB 1389066A GB 1218372 A GB1218372 A GB 1218372A GB 1218372 A GB1218372 A GB 1218372A GB 1389066 A GB1389066 A GB 1389066A
Authority
GB
United Kingdom
Prior art keywords
unit
transfer
request
memory
queue
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB1218372A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Digital Equipment Corp
Original Assignee
Digital Equipment Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Digital Equipment Corp filed Critical Digital Equipment Corp
Publication of GB1389066A publication Critical patent/GB1389066A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/86—Re-recording, i.e. transcribing information from one magnetisable record carrier on to one or more similar or dissimilar record carriers

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Information Retrieval, Db Structures And Fs Structures Therefor (AREA)

Abstract

1389066 Data processing DIGITAL EQUIPMENT CORP 15 March 1972 [15 March 1971] 12183/72 Heading G4C A digital data processing system including a random access memory 12 and one (or more) serial access memory units 26, 28, 32, 36 (e.g. magnetic drums, discs or tapes), queues requests for data transfer between them and selects for execution the request requiring the least delay. in positioning the transducers of the serial access unit. The system comprises a computer having an arithmetic unit 14, an 1/0 controller 16, controller units, 20, 34, 38 and channel units 22, 24. The computer executes a running program and, whenever a . request arises for data transfer between memory 12 and one of the serial access units, an executive routine is entered. The request specifies whether the transfer is from or to memory 12, which serial memory unit is involved and the desired tracks and segments thereof. If the read/write heads have to be repositioned and the controller unit is transferring data, the request is moved to an awaiting positioning queue (in memory 12) for that memory unit. If the controller unit is avaiable the read/write head is positioned. If the head is positioned correctly and the controller unit or data channel unit is transferring data the request is passed to an awaiting transfer queue for the data channel unit. If the head is positioned correctly and the controller and channel units are free, then the request is executed. Every time a head positioning or data transfer operation occurs, the running program is interrupted and the executive routine transfers requests for which the head is correctly positioned to the awaiting transfer queue. In the positioning queues the transfer with the smallest positioning time is selected first while in the other queue the transfer with the smallest latency time (i.e. time to find the desired segment), is selected but, in both cases, transfers are sometimes dealt with on a first come first served basis, or some transfers have priority. An awaiting seeking queue is also described and the system has time sharing facilities.
GB1218372A 1971-03-15 1972-03-15 Method for controlling digital data processing systems Expired GB1389066A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12466871A 1971-03-15 1971-03-15

Publications (1)

Publication Number Publication Date
GB1389066A true GB1389066A (en) 1975-04-03

Family

ID=22416174

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1218372A Expired GB1389066A (en) 1971-03-15 1972-03-15 Method for controlling digital data processing systems

Country Status (5)

Country Link
CA (1) CA980009A (en)
DE (1) DE2212585A1 (en)
GB (1) GB1389066A (en)
IE (1) IE36475B1 (en)
IT (1) IT952975B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588521A1 (en) * 1992-08-26 1994-03-23 International Business Machines Corporation System and method for regulating access to direct access storage devices in data processing systems

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0588521A1 (en) * 1992-08-26 1994-03-23 International Business Machines Corporation System and method for regulating access to direct access storage devices in data processing systems
US5428796A (en) * 1992-08-26 1995-06-27 International Business Machines Corporation System and method for regulating access to direct access storage devices in data processing systems

Also Published As

Publication number Publication date
CA980009A (en) 1975-12-16
DE2212585A1 (en) 1972-12-07
IE36475L (en) 1972-09-15
IT952975B (en) 1973-07-30
IE36475B1 (en) 1976-11-10

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years