JPS54148440A - Electronic apparatus - Google Patents
Electronic apparatusInfo
- Publication number
- JPS54148440A JPS54148440A JP5783178A JP5783178A JPS54148440A JP S54148440 A JPS54148440 A JP S54148440A JP 5783178 A JP5783178 A JP 5783178A JP 5783178 A JP5783178 A JP 5783178A JP S54148440 A JPS54148440 A JP S54148440A
- Authority
- JP
- Japan
- Prior art keywords
- rom
- ram
- cartridge
- terminal
- gate
- 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
Landscapes
- Storage Device Security (AREA)
- Read Only Memory (AREA)
Abstract
PURPOSE: To avoid the miswriting to ROM by forming the memory unit in such constitution that the ROM cartridge and the RAM cartridge may be interchangeable to each other and also by providing the means to decide whether the ROM or RAM cartridge.
CONSTITUTION: The memory unit is formed with the cartridge consisting of ROM and the cartridge consisting of RAM, and both ROM and RAM are inserted to the same place in the main body of the apparatus in an interchangeable way. These cartridges contains terminal S which can identify the ROM or RAM, and terminal S is set at the H and L levels in the case of the ROM and RAM respectively. With insertion of the ROM cartridge, AND gate A1 and OR gate O1 are opened since terminal S is at the H level. And the CE signal deciding whether or not the chip should be selected is supplied to the chip selector terminal. On the other hand, AND gate A3 is closed to inhibit reading signal MEMR. Also with insertion of the RAM cartridge, the CE and MEMR signals are supplied to the CS terminal via gate A2 or A3 to identify ROM or RAM.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53057831A JPS5831670B2 (en) | 1978-05-15 | 1978-05-15 | Electronics |
US06/038,546 US4259668A (en) | 1978-05-15 | 1979-05-14 | Television set/calculator interface including exchangeable keyboard panel and program memory cartridge |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53057831A JPS5831670B2 (en) | 1978-05-15 | 1978-05-15 | Electronics |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54148440A true JPS54148440A (en) | 1979-11-20 |
JPS5831670B2 JPS5831670B2 (en) | 1983-07-07 |
Family
ID=13066875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53057831A Expired JPS5831670B2 (en) | 1978-05-15 | 1978-05-15 | Electronics |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5831670B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5843358U (en) * | 1981-09-18 | 1983-03-23 | 株式会社ハイメカ工機 | dust collector |
JPS58111167A (en) * | 1981-12-25 | 1983-07-02 | Canon Inc | Accommodating device for storing medium |
JPS5915934U (en) * | 1982-07-21 | 1984-01-31 | 郵政大臣 | postage display machine |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2019176956A1 (en) | 2018-03-12 | 2019-09-19 | 三菱マテリアル株式会社 | Titanium base material, method for producing titanium base material, electrode for water electrolysis, and water electrolysis device |
-
1978
- 1978-05-15 JP JP53057831A patent/JPS5831670B2/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5843358U (en) * | 1981-09-18 | 1983-03-23 | 株式会社ハイメカ工機 | dust collector |
JPS58111167A (en) * | 1981-12-25 | 1983-07-02 | Canon Inc | Accommodating device for storing medium |
JPS5915934U (en) * | 1982-07-21 | 1984-01-31 | 郵政大臣 | postage display machine |
Also Published As
Publication number | Publication date |
---|---|
JPS5831670B2 (en) | 1983-07-07 |
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