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JPS569855A - Magnetic tape control system - Google Patents

Magnetic tape control system

Info

Publication number
JPS569855A
JPS569855A JP8562179A JP8562179A JPS569855A JP S569855 A JPS569855 A JP S569855A JP 8562179 A JP8562179 A JP 8562179A JP 8562179 A JP8562179 A JP 8562179A JP S569855 A JPS569855 A JP S569855A
Authority
JP
Japan
Prior art keywords
block
circuit
circuits
coincidence
compared
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
JP8562179A
Other languages
Japanese (ja)
Inventor
Takeo Tsunoda
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP8562179A priority Critical patent/JPS569855A/en
Publication of JPS569855A publication Critical patent/JPS569855A/en
Pending legal-status Critical Current

Links

Landscapes

  • Debugging And Monitoring (AREA)

Abstract

PURPOSE: To make it possible to detect accurately an information block position where an error has occurred by performing processing by making comparisons between information block sequence numbers and intra-block logical code word lengths before and after information is written by a magnetic tape unit.
CONSTITUTION: Block detecting circuit 1 detects block sequence number NA and block word length LA from an input information block and stores them in memory circuits 2 and 3. The information block, after being written on a magnetic tape by write control circuit 4, is read by reading circuit 5, whose output is input to block detecting circuit 7. Circuit 7 detects number NA and word length LA and stores them in memory circuits 8 and 10. Numbers NA in circuits 2 and 8 are compared with each other by coincidence circuit 13 and the count value of block sequence counter 9 is compared to the output value of circuit 8 by coincidence circuit 14. Word lengths LA in circuits 3 and 10 are also compared to each other by coincidence circuit 16 and the count value of block length counter 11 is further compared to the output value of ciruit 10 by coincidence circuit 17. When even one of four coincidence circuits generates a dissidence output, a decision on an error is made and that is reported to a host unit together with number NA.
COPYRIGHT: (C)1981,JPO&Japio
JP8562179A 1979-07-05 1979-07-05 Magnetic tape control system Pending JPS569855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8562179A JPS569855A (en) 1979-07-05 1979-07-05 Magnetic tape control system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8562179A JPS569855A (en) 1979-07-05 1979-07-05 Magnetic tape control system

Publications (1)

Publication Number Publication Date
JPS569855A true JPS569855A (en) 1981-01-31

Family

ID=13863910

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8562179A Pending JPS569855A (en) 1979-07-05 1979-07-05 Magnetic tape control system

Country Status (1)

Country Link
JP (1) JPS569855A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158008A (en) * 1981-03-06 1982-09-29 Ibm Record memory system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975304A (en) * 1972-11-22 1974-07-20
JPS5071239A (en) * 1973-10-25 1975-06-13
JPS51140433A (en) * 1975-05-30 1976-12-03 Hitachi Ltd Write data checking system
JPS5275239A (en) * 1975-12-19 1977-06-24 Sharp Corp Magnetic card read and write unit
JPS5347870U (en) * 1977-09-01 1978-04-22

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4975304A (en) * 1972-11-22 1974-07-20
JPS5071239A (en) * 1973-10-25 1975-06-13
JPS51140433A (en) * 1975-05-30 1976-12-03 Hitachi Ltd Write data checking system
JPS5275239A (en) * 1975-12-19 1977-06-24 Sharp Corp Magnetic card read and write unit
JPS5347870U (en) * 1977-09-01 1978-04-22

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158008A (en) * 1981-03-06 1982-09-29 Ibm Record memory system
JPH0150928B2 (en) * 1981-03-06 1989-11-01 Intaanashonaru Bijinesu Mashiinzu Corp

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