JPS5487438A - Backup system of volatile memory - Google Patents

Backup system of volatile memory

Info

Publication number
JPS5487438A
JPS5487438A JP15586577A JP15586577A JPS5487438A JP S5487438 A JPS5487438 A JP S5487438A JP 15586577 A JP15586577 A JP 15586577A JP 15586577 A JP15586577 A JP 15586577A JP S5487438 A JPS5487438 A JP S5487438A
Authority
JP
Japan
Prior art keywords
memory
function
master station
public circuit
station
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
JP15586577A
Other languages
Japanese (ja)
Inventor
Masaaki Ikenaga
Yasuharu Moriya
Katsutomo Itayama
Toru Nakagawa
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.)
NEC Corp
Nippon Telegraph and Telephone Corp
Original Assignee
NEC Corp
Nippon Telegraph and Telephone Corp
Nippon 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 NEC Corp, Nippon Telegraph and Telephone Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP15586577A priority Critical patent/JPS5487438A/en
Publication of JPS5487438A publication Critical patent/JPS5487438A/en
Pending legal-status Critical Current

Links

Landscapes

  • Hardware Redundancy (AREA)
  • Computer And Data Communications (AREA)

Abstract

PURPOSE: To reduce the needed number of backup memory units to one by using a backup memory unit, installed in a subordinate station and master station with a memory unit, through a public circuit.
CONSTITUTION: Several subordinate stations 1 are provided which has a CPU controlled by both programs stored in a nonvolatile memory ROM and data in a volatile memory RAM and the function of calling master station 3 via public circuit 2 right after the power is put to work when the memory RAM becomes volatile due to the cutting-off of the power supply. Then, subordinate station 1 controls an uncontrolled unit via an input-output I/O connected to the CPU. Once the cutting- off of the power supply is detected, the function is switched automatically to a fault program function and the contents of memory unit DRUM such as a magnetic drum provided to master station 3 are stored automatically or manually in the RAM via public circuit 2; and after data are all stored, information on a data transfer end is transmitted, thereby stopping the fault program to run.
COPYRIGHT: (C)1979,JPO&Japio
JP15586577A 1977-12-23 1977-12-23 Backup system of volatile memory Pending JPS5487438A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15586577A JPS5487438A (en) 1977-12-23 1977-12-23 Backup system of volatile memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15586577A JPS5487438A (en) 1977-12-23 1977-12-23 Backup system of volatile memory

Publications (1)

Publication Number Publication Date
JPS5487438A true JPS5487438A (en) 1979-07-11

Family

ID=15615186

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15586577A Pending JPS5487438A (en) 1977-12-23 1977-12-23 Backup system of volatile memory

Country Status (1)

Country Link
JP (1) JPS5487438A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09138759A (en) * 1995-11-14 1997-05-27 Nec Corp Host computer and distributed processing-type system for terminal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109635A (en) * 1974-02-04 1975-08-28
JPS5169334A (en) * 1974-12-13 1976-06-15 Fujitsu Ltd Inisharu puroguramu roodoseigyohoshiki

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50109635A (en) * 1974-02-04 1975-08-28
JPS5169334A (en) * 1974-12-13 1976-06-15 Fujitsu Ltd Inisharu puroguramu roodoseigyohoshiki

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09138759A (en) * 1995-11-14 1997-05-27 Nec Corp Host computer and distributed processing-type system for terminal

Similar Documents

Publication Publication Date Title
JPS5487438A (en) Backup system of volatile memory
JPS54160129A (en) Power source control system
JPS52103650A (en) Automatic device for distribution line
JPS528899A (en) Automatic vending system
JPS51137333A (en) A control system for buffer memory unit at a fault
JPS52107741A (en) Peripheral control unit
JPS53114635A (en) Data highway system
JPS5289439A (en) Computer backup system
JPS5387637A (en) Loop control system
JPS547250A (en) Process computer control system
JPS52113484A (en) Control system
JPS53106535A (en) System control system
JPS537148A (en) Multiplex loop bus system
JPS5442955A (en) Data collection system
JPS5397733A (en) Automatic power source control device for information process system
JPS5291144A (en) Load control apparatus for electric power system
JPS533033A (en) Code branching system for intelligent terminal unit
JPS526947A (en) Power distribution system
JPS53108748A (en) System control system
JPS528441A (en) Power supplying system
JPS5432024A (en) Automatic power supply control system
JPS52101441A (en) Increasing method of substations
JPS52130245A (en) Control system for information collection memory unit
JPS51148172A (en) An atutomatic control apparatus
JPS5418644A (en) Auxiliary switching system