JPS55116156A - Multiple access unit for external memory unit - Google Patents

Multiple access unit for external memory unit

Info

Publication number
JPS55116156A
JPS55116156A JP2337479A JP2337479A JPS55116156A JP S55116156 A JPS55116156 A JP S55116156A JP 2337479 A JP2337479 A JP 2337479A JP 2337479 A JP2337479 A JP 2337479A JP S55116156 A JPS55116156 A JP S55116156A
Authority
JP
Japan
Prior art keywords
controller
cpu1
access
driver
unit
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.)
Pending
Application number
JP2337479A
Other languages
Japanese (ja)
Inventor
Yoshio Hirota
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co Ltd
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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP2337479A priority Critical patent/JPS55116156A/en
Publication of JPS55116156A publication Critical patent/JPS55116156A/en
Pending legal-status Critical Current

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  • Hardware Redundancy (AREA)
  • Multi Processors (AREA)

Abstract

PURPOSE: To make it possible to back up a system on occurrence of a fault of a controller by eliminating the latency time of controllers, by connecting drivers to the controllers.
CONSTITUTION: When access from CPU1-2 to driver 3-1-2 should be attained while CPU1-1 is in process of access to driver 3-1-1 via input port 11-1 and output port 01-1 of controller 2-1 and connection cable C5, CPU1-2 attains access to driver 31-2 via input port 12-1 and output port 02-1 of controller 2-2 and connection cable C12 after making sure that while controller 2-1 is exclusively used by CPU1-1, controller 2-2 is standing by. Similarly, access to the same driver is attained via a different controller when CPU judges that either controller 2-1 or 2-2 is in trouble.
COPYRIGHT: (C)1980,JPO&Japio
JP2337479A 1979-03-02 1979-03-02 Multiple access unit for external memory unit Pending JPS55116156A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2337479A JPS55116156A (en) 1979-03-02 1979-03-02 Multiple access unit for external memory unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2337479A JPS55116156A (en) 1979-03-02 1979-03-02 Multiple access unit for external memory unit

Publications (1)

Publication Number Publication Date
JPS55116156A true JPS55116156A (en) 1980-09-06

Family

ID=12108761

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2337479A Pending JPS55116156A (en) 1979-03-02 1979-03-02 Multiple access unit for external memory unit

Country Status (1)

Country Link
JP (1) JPS55116156A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077007A2 (en) * 1981-10-05 1983-04-20 Digital Equipment Corporation Secondary storage facility employing serial communications between drive and controller
JPS59111516A (en) * 1982-12-17 1984-06-27 Fujitsu Ltd Interface switching system
US4825406A (en) * 1981-10-05 1989-04-25 Digital Equipment Corporation Secondary storage facility employing serial communications between drive and controller
JPH03177950A (en) * 1989-11-28 1991-08-01 Internatl Business Mach Corp <Ibm> Data processing apparatus and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0077007A2 (en) * 1981-10-05 1983-04-20 Digital Equipment Corporation Secondary storage facility employing serial communications between drive and controller
US4825406A (en) * 1981-10-05 1989-04-25 Digital Equipment Corporation Secondary storage facility employing serial communications between drive and controller
JPS59111516A (en) * 1982-12-17 1984-06-27 Fujitsu Ltd Interface switching system
JPH03177950A (en) * 1989-11-28 1991-08-01 Internatl Business Mach Corp <Ibm> Data processing apparatus and method

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