JPS55118150A - Computer circuit - Google Patents
Computer circuitInfo
- Publication number
- JPS55118150A JPS55118150A JP2527679A JP2527679A JPS55118150A JP S55118150 A JPS55118150 A JP S55118150A JP 2527679 A JP2527679 A JP 2527679A JP 2527679 A JP2527679 A JP 2527679A JP S55118150 A JPS55118150 A JP S55118150A
- Authority
- JP
- Japan
- Prior art keywords
- rom5b
- ram6
- switches
- alteration
- program
- 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
- Debugging And Monitoring (AREA)
- For Increasing The Reliability Of Semiconductor Memories (AREA)
- Techniques For Improving Reliability Of Storages (AREA)
Abstract
PURPOSE: To secure the simple and quick alteration of the program by installing the RAM to facilitate the alteration of the program and the address switching circuit to the computer memory circuit.
CONSTITUTION: Switches 101aW101n are provided between address decoder 4 and ROM5, and at the same time switch 102 is added between RAM6 and decoder 4 each. In the example requiring the alteration to ROM5b, first switches 101b and 102 are connected as shown by the dotted lines, and then the program contents of ROM5b are copied to RAM6 via CPU1. Then the contents of RAM6 are corrected properly with switches 101 and 102 kept in the state of the dotted line. After correction, switches 101b and 102 are switched as shown by the solid lines. As a result, no activation is given to ROM5b, and instead RAM6 is activated with the address information of ROM5b.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2527679A JPS55118150A (en) | 1979-03-05 | 1979-03-05 | Computer circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2527679A JPS55118150A (en) | 1979-03-05 | 1979-03-05 | Computer circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55118150A true JPS55118150A (en) | 1980-09-10 |
Family
ID=12161491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2527679A Pending JPS55118150A (en) | 1979-03-05 | 1979-03-05 | Computer circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55118150A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5794844A (en) * | 1980-12-03 | 1982-06-12 | Hitachi Ltd | Data processor |
-
1979
- 1979-03-05 JP JP2527679A patent/JPS55118150A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5794844A (en) * | 1980-12-03 | 1982-06-12 | Hitachi Ltd | Data processor |
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