JPS55109000A - Memory unit erasing system - Google Patents
Memory unit erasing systemInfo
- Publication number
- JPS55109000A JPS55109000A JP1678779A JP1678779A JPS55109000A JP S55109000 A JPS55109000 A JP S55109000A JP 1678779 A JP1678779 A JP 1678779A JP 1678779 A JP1678779 A JP 1678779A JP S55109000 A JPS55109000 A JP S55109000A
- Authority
- JP
- Japan
- Prior art keywords
- memory
- address
- erase
- circuit
- memory 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
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To make it possible to erase partially memory contents to shorten the program re-read time, by providing an address select circuit in a CPU.
CONSTITUTION: The maximum address and the minimum address of the area which the user does not want to erase in main memory unit 2 are set to registers 5 and 6 respectively by switch 4 for address indication provided in CPU1, and memory erase button 3 is depressed. Address select circuit 7 does not apply a reset voltage only to memory elements of the area designated by registers 5 and 6. Then, the reset voltage is generated for addresses, which are not designated by circuit 7, from memory erase circuit 8, and memory contents of these addresses are erased.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1678779A JPS55109000A (en) | 1979-02-16 | 1979-02-16 | Memory unit erasing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1678779A JPS55109000A (en) | 1979-02-16 | 1979-02-16 | Memory unit erasing system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55109000A true JPS55109000A (en) | 1980-08-21 |
Family
ID=11925882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1678779A Pending JPS55109000A (en) | 1979-02-16 | 1979-02-16 | Memory unit erasing system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55109000A (en) |
-
1979
- 1979-02-16 JP JP1678779A patent/JPS55109000A/en active Pending
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