[go: up one dir, main page]

JPS57172600A - Program loading device of electronic equipment - Google Patents

Program loading device of electronic equipment

Info

Publication number
JPS57172600A
JPS57172600A JP56058884A JP5888481A JPS57172600A JP S57172600 A JPS57172600 A JP S57172600A JP 56058884 A JP56058884 A JP 56058884A JP 5888481 A JP5888481 A JP 5888481A JP S57172600 A JPS57172600 A JP S57172600A
Authority
JP
Japan
Prior art keywords
ram
cpu
bus interface
write
electronic equipment
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
Application number
JP56058884A
Other languages
Japanese (ja)
Inventor
Satoru Naoi
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.)
Omron Corp
Original Assignee
Tateisi Electronics Co
Omron Tateisi Electronics Co
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 Tateisi Electronics Co, Omron Tateisi Electronics Co filed Critical Tateisi Electronics Co
Priority to JP56058884A priority Critical patent/JPS57172600A/en
Publication of JPS57172600A publication Critical patent/JPS57172600A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F12/00—Accessing, addressing or allocating within memory systems or architectures
    • G06F12/14—Protection against unauthorised use of memory or access to memory

Landscapes

  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Storage Device Security (AREA)
  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE:To reset a write protecting function outside of a housing by providing the 2nd switch for a write mode command for supplying a write enable signal to a memory according to an operation state without reference to the opening and closing state of the 1st switch outside of an electronic equipment. CONSTITUTION:A CPU 2 is connected to an RAM 5 through a data bus interface 3. The CPU 2 is further connected to the RAM 5 through an address bus interface 4. Data supplied to the RAM 5 through an address decoder 6 is a one for specifying a block (or chip) of a memory, and data supplied from the address bus interface 4 to the RAM 5 is a one for showing the address of the memory block. The CPU 2 is furthermore connected to the RAM 5 through a write protection control circuit 7.
JP56058884A 1981-04-17 1981-04-17 Program loading device of electronic equipment Pending JPS57172600A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56058884A JPS57172600A (en) 1981-04-17 1981-04-17 Program loading device of electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56058884A JPS57172600A (en) 1981-04-17 1981-04-17 Program loading device of electronic equipment

Publications (1)

Publication Number Publication Date
JPS57172600A true JPS57172600A (en) 1982-10-23

Family

ID=13097191

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56058884A Pending JPS57172600A (en) 1981-04-17 1981-04-17 Program loading device of electronic equipment

Country Status (1)

Country Link
JP (1) JPS57172600A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0345296U (en) * 1989-09-07 1991-04-25
US10339328B1 (en) 2014-07-15 2019-07-02 Cru Acquisition Group, Llc Securing stored computer files from modification

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52155945A (en) * 1976-06-21 1977-12-24 Tokyo Electric Co Ltd Electronic cash register
JPS542026A (en) * 1977-06-07 1979-01-09 Hitachi Ltd Memory unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52155945A (en) * 1976-06-21 1977-12-24 Tokyo Electric Co Ltd Electronic cash register
JPS542026A (en) * 1977-06-07 1979-01-09 Hitachi Ltd Memory unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0345296U (en) * 1989-09-07 1991-04-25
US10339328B1 (en) 2014-07-15 2019-07-02 Cru Acquisition Group, Llc Securing stored computer files from modification
US10936742B1 (en) 2014-07-15 2021-03-02 Cru Data Security Group, Llc Systems and methods for securing stored computer files from modification
US11475152B1 (en) 2014-07-15 2022-10-18 Cru Data Security Group, Llc Systems and methods for securing stored computer files from modification with control circuit

Similar Documents

Publication Publication Date Title
EP0561271A3 (en)
JPS56140452A (en) Memory protection system
CA2113035A1 (en) Ram protection apparatus
EP0565855A3 (en) Data integrity assurance in a disk drive upon a power failure
JPS57172600A (en) Program loading device of electronic equipment
JPS57135500A (en) Data memory protecting circuit
JPS57103187A (en) Semiconductor storage element
JPS5451334A (en) Protector for memeory content of data memory device
JPS57152053A (en) Program tracing device
JPS57176600A (en) One chip microcomputer
EP0138045A3 (en) Apparatus and method for synchronization of peripheral devices via bus cycle alteration in a microprocessor implemented data processing system
JPS5593594A (en) Bulk controller having data protection function
JPS55135960A (en) Micro-computer
JPS55166727A (en) Microcomputer system
JPS5696356A (en) Multimicroprocessor
JPS57136841A (en) Terminal device
JPS5771057A (en) Computer protection device
JPS5587221A (en) Channel unit
JPS57117199A (en) Memory device possible for remote supervisory
JPS5471910A (en) Electronic exchange
JPS5729166A (en) Microcomputer control system
JPS5373934A (en) Data exchange control system
JPS56116153A (en) Trap control circuit
JPS57134754A (en) Automatic restoring device for microcomputer
JPS5752974A (en) Storage device