JPS55116156A - Multiple access unit for external memory unit - Google Patents
Multiple access unit for external memory unitInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1979
- 1979-03-02 JP JP2337479A patent/JPS55116156A/en active Pending
Cited By (4)
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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