JPS5595161A - Mass storage controller with data protective function - Google Patents
Mass storage controller with data protective functionInfo
- Publication number
- JPS5595161A JPS5595161A JP153079A JP153079A JPS5595161A JP S5595161 A JPS5595161 A JP S5595161A JP 153079 A JP153079 A JP 153079A JP 153079 A JP153079 A JP 153079A JP S5595161 A JPS5595161 A JP S5595161A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- switch
- protection
- protective
- area
- 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.)
- Granted
Links
Abstract
PURPOSE: To prevent data in a protective area from breaking down by allowing the protective area to be changed or data to be rewritten through the operation an operator.
CONSTITUTION: Controller 1 linking CPU to magnetic disk unit 7 has protection change switch S1, protection validating switch S2, protection change flag 2, protective memory 3 composed of a volatile memory, control part 4, and comparator 5 and connects to external nonvolatile memory 6 with the same contents as memory 3. To select an area on disk 7 from CPU, the output of memory 3 is compared with information equivalent to area indication supplied to comparator 5 and the state of protection is outputted to control part 4. If switch S1 is not turned ON by the operator, protective areas can not be changed and when switch S2 is ON, the protection state of memory 3 is effective while it is ineffective with the switch OFF. Consequently, the data breakdown in a protective area due to a program error, a program getting out of control, etc., can be prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP153079A JPS5595161A (en) | 1979-01-09 | 1979-01-09 | Mass storage controller with data protective function |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP153079A JPS5595161A (en) | 1979-01-09 | 1979-01-09 | Mass storage controller with data protective function |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5595161A true JPS5595161A (en) | 1980-07-19 |
JPS6117013B2 JPS6117013B2 (en) | 1986-05-06 |
Family
ID=11504065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP153079A Granted JPS5595161A (en) | 1979-01-09 | 1979-01-09 | Mass storage controller with data protective function |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5595161A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3044502U (en) * | 1997-06-16 | 1997-12-22 | 株式会社トリオパック | Internal lock box structure |
-
1979
- 1979-01-09 JP JP153079A patent/JPS5595161A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS6117013B2 (en) | 1986-05-06 |
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