JPS5683898A - Prom error detection system - Google Patents

Prom error detection system

Info

Publication number
JPS5683898A
JPS5683898A JP16122879A JP16122879A JPS5683898A JP S5683898 A JPS5683898 A JP S5683898A JP 16122879 A JP16122879 A JP 16122879A JP 16122879 A JP16122879 A JP 16122879A JP S5683898 A JPS5683898 A JP S5683898A
Authority
JP
Japan
Prior art keywords
prom
elements
written
data
anomaly
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
JP16122879A
Other languages
Japanese (ja)
Inventor
Kazuyoshi Haruhara
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP16122879A priority Critical patent/JPS5683898A/en
Publication of JPS5683898A publication Critical patent/JPS5683898A/en
Pending legal-status Critical Current

Links

Landscapes

  • Read Only Memory (AREA)
  • For Increasing The Reliability Of Semiconductor Memories (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE: To detect rapidly a PROM element where anomaly occured, by displaying an error element on a basis of comparison between a check data for every element stored in a prescribed area of the PROM and a data of the element.
CONSTITUTION: PROM12 which constitutes a cash register or the like together with CPU11, totaling memory 13, and so on is formed with memory elements 121... where K-byte information is written in a prescribed address position respectively, and in element 12N, not only information forming a part of the program is written similarly to other elements 121... but also check data such as exclusive OR of storage information words of elements 121... are written in prescribed address areas P0.... By this constitution of ROM12, at the anomaly occurrence time of the cash register or the line, storage data for every element 121... is subjected to exclusive OR processing and is compared with check data in addresses P0... of element 12N to display elements 121... for disagreement, and thus, the PROM element where anomaly occurs is detected rapidly without connection to the external device.
COPYRIGHT: (C)1981,JPO&Japio
JP16122879A 1979-12-12 1979-12-12 Prom error detection system Pending JPS5683898A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16122879A JPS5683898A (en) 1979-12-12 1979-12-12 Prom error detection system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16122879A JPS5683898A (en) 1979-12-12 1979-12-12 Prom error detection system

Publications (1)

Publication Number Publication Date
JPS5683898A true JPS5683898A (en) 1981-07-08

Family

ID=15731056

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16122879A Pending JPS5683898A (en) 1979-12-12 1979-12-12 Prom error detection system

Country Status (1)

Country Link
JP (1) JPS5683898A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52112243A (en) * 1976-03-17 1977-09-20 Nippon Signal Co Ltd:The Error detection system for exclusive reading memory
JPS54114131A (en) * 1978-02-27 1979-09-06 Toyoda Machine Works Ltd Method of diagnosing read only memory
JPS54117641A (en) * 1978-03-06 1979-09-12 Fujitsu Fanuc Ltd Memory inspecting system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52112243A (en) * 1976-03-17 1977-09-20 Nippon Signal Co Ltd:The Error detection system for exclusive reading memory
JPS54114131A (en) * 1978-02-27 1979-09-06 Toyoda Machine Works Ltd Method of diagnosing read only memory
JPS54117641A (en) * 1978-03-06 1979-09-12 Fujitsu Fanuc Ltd Memory inspecting system

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