JPS54148440A - Electronic apparatus - Google Patents

Electronic apparatus

Info

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
Application number
JP5783178A
Other languages
Japanese (ja)
Other versions
JPS5831670B2 (en
Inventor
Kosuke Nishimura
Hirohide Nakagawa
Isamu Haneda
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 JP53057831A priority Critical patent/JPS5831670B2/en
Priority to US06/038,546 priority patent/US4259668A/en
Publication of JPS54148440A publication Critical patent/JPS54148440A/en
Publication of JPS5831670B2 publication Critical patent/JPS5831670B2/en
Expired legal-status Critical Current

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
JP53057831A 1978-05-15 1978-05-15 Electronics Expired JPS5831670B2 (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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