JPS5595161A - Mass storage controller with data protective function - Google Patents

Mass storage controller with data protective function

Info

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
Application number
JP153079A
Other languages
Japanese (ja)
Other versions
JPS6117013B2 (en
Inventor
Seiichi Senoo
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.)
Sharp Corp
Original Assignee
Sharp Corp
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 Sharp Corp filed Critical Sharp Corp
Priority to JP153079A priority Critical patent/JPS5595161A/en
Publication of JPS5595161A publication Critical patent/JPS5595161A/en
Publication of JPS6117013B2 publication Critical patent/JPS6117013B2/ja
Granted legal-status Critical Current

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
JP153079A 1979-01-09 1979-01-09 Mass storage controller with data protective function Granted JPS5595161A (en)

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)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JPS6117013B2 (en) 1986-05-06

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