JPS55129996A - Write system of read-only memory - Google Patents

Write system of read-only memory

Info

Publication number
JPS55129996A
JPS55129996A JP3481079A JP3481079A JPS55129996A JP S55129996 A JPS55129996 A JP S55129996A JP 3481079 A JP3481079 A JP 3481079A JP 3481079 A JP3481079 A JP 3481079A JP S55129996 A JPS55129996 A JP S55129996A
Authority
JP
Japan
Prior art keywords
print board
rom4
address
board
inputted
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
JP3481079A
Other languages
Japanese (ja)
Inventor
Masaharu Yoshihara
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.)
Fujitsu Ltd
Original Assignee
Fujitsu Ltd
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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP3481079A priority Critical patent/JPS55129996A/en
Publication of JPS55129996A publication Critical patent/JPS55129996A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/06—Auxiliary circuits, e.g. for writing into memory
    • G11C16/10—Programming or data input circuits

Abstract

PURPOSE:To make it possible to write data simply in a short time, by erasing and writing data collectively. CONSTITUTION:Print board 2 where ROM4 to be rewritten in mounted is removed from the print board, and ultraviolet rays are irradiated to all the surface of print board 2 to erase contents of ROM4 collectively. Next, an address signal is inputted through address bus 2a to designate an address. The unit of addresses is caused to agree with the unit designated by a processor. Next, a chip select signal is inputted through select signal line 2c to select ROM4, and a program is written through data bus 2b. After rewriting pring board 2 in this manner, print board 2 is fitted to the print board again.
JP3481079A 1979-03-23 1979-03-23 Write system of read-only memory Pending JPS55129996A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3481079A JPS55129996A (en) 1979-03-23 1979-03-23 Write system of read-only memory

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3481079A JPS55129996A (en) 1979-03-23 1979-03-23 Write system of read-only memory

Publications (1)

Publication Number Publication Date
JPS55129996A true JPS55129996A (en) 1980-10-08

Family

ID=12424564

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3481079A Pending JPS55129996A (en) 1979-03-23 1979-03-23 Write system of read-only memory

Country Status (1)

Country Link
JP (1) JPS55129996A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5995498U (en) * 1982-12-20 1984-06-28 日本電気株式会社 Storage device
US4984212A (en) * 1984-09-26 1991-01-08 Hitachi, Ltd. Semiconductor memory
US5136546A (en) * 1984-09-26 1992-08-04 Hitachi, Ltd. Semiconductor memory

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5995498U (en) * 1982-12-20 1984-06-28 日本電気株式会社 Storage device
US4984212A (en) * 1984-09-26 1991-01-08 Hitachi, Ltd. Semiconductor memory
US5136546A (en) * 1984-09-26 1992-08-04 Hitachi, Ltd. Semiconductor memory

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