JPS5487438A - Backup system of volatile memory - Google Patents
Backup system of volatile memoryInfo
- 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
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
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)
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)
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 |
-
1977
- 1977-12-23 JP JP15586577A patent/JPS5487438A/en active Pending
Patent Citations (2)
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)
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 |
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