JPS5454610A - Magnetic tape control system - Google Patents

Magnetic tape control system

Info

Publication number
JPS5454610A
JPS5454610A JP12173677A JP12173677A JPS5454610A JP S5454610 A JPS5454610 A JP S5454610A JP 12173677 A JP12173677 A JP 12173677A JP 12173677 A JP12173677 A JP 12173677A JP S5454610 A JPS5454610 A JP S5454610A
Authority
JP
Japan
Prior art keywords
power supply
processing
reset
contents
serial number
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
JP12173677A
Other languages
Japanese (ja)
Other versions
JPS5944694B2 (en
Inventor
Koji Munakata
Kiyoshi Uchiumi
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 JP52121736A priority Critical patent/JPS5944694B2/en
Publication of JPS5454610A publication Critical patent/JPS5454610A/en
Publication of JPS5944694B2 publication Critical patent/JPS5944694B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Signal Processing For Digital Recording And Reproducing (AREA)
  • Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
  • Digital Magnetic Recording (AREA)

Abstract

PURPOSE: To achieve the prevention of errors which occur in processing after restarting by moving processing direction in the opposite direction and performing check read in the forward direction when power supply has been turned ON while power supply cutoff state occurrence is indicated in a service interruption memory.
CONSTITUTION: When a power supply cutoff state is caused, a CPU sets this and stores the contents of a block serial number counter in a block serial number memory 8. When the power supply is turned ON in this state, and AND 13 goes ON and an FF 9 sets, by which the reverse are executed. At the same time, the reverse execution time is measured with a timer 11 and when it times out, the FF 9 is reset to stop the reverse, and also an FF 10 is set, by which forward instruction is accomplished. During this processing time, the contents of the block serial number counter are compared with the contents of the memory 8 and when a comparator 12 produces a coincidence signal, the FF 10 is reset to stop the forward instruction. Thereby, the errors to be produced in processing after the reset of power supply are surely prevented
COPYRIGHT: (C)1979,JPO&Japio
JP52121736A 1977-10-11 1977-10-11 Magnetic tape control method Expired JPS5944694B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52121736A JPS5944694B2 (en) 1977-10-11 1977-10-11 Magnetic tape control method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52121736A JPS5944694B2 (en) 1977-10-11 1977-10-11 Magnetic tape control method

Publications (2)

Publication Number Publication Date
JPS5454610A true JPS5454610A (en) 1979-05-01
JPS5944694B2 JPS5944694B2 (en) 1984-10-31

Family

ID=14818598

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52121736A Expired JPS5944694B2 (en) 1977-10-11 1977-10-11 Magnetic tape control method

Country Status (1)

Country Link
JP (1) JPS5944694B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589201A (en) * 1981-07-07 1983-01-19 Toshiba Corp Record protecting method of magnetic disk storage device
JPS6013353A (en) * 1983-07-01 1985-01-23 Matsushita Electric Ind Co Ltd Reproducing device of disc data
JPS6028081A (en) * 1983-06-30 1985-02-13 スタ−ル・ソシエテ・アノニム Record disc player
JPS6166280A (en) * 1984-09-06 1986-04-05 Matsushita Electric Ind Co Ltd Reproducer of information recorded disk
JPS6313176A (en) * 1987-03-03 1988-01-20 Yamaha Corp Disk reproducing device

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS589201A (en) * 1981-07-07 1983-01-19 Toshiba Corp Record protecting method of magnetic disk storage device
JPS6028081A (en) * 1983-06-30 1985-02-13 スタ−ル・ソシエテ・アノニム Record disc player
JPH0311032B2 (en) * 1983-06-30 1991-02-15 Staar Sa
JPS6013353A (en) * 1983-07-01 1985-01-23 Matsushita Electric Ind Co Ltd Reproducing device of disc data
JPS6166280A (en) * 1984-09-06 1986-04-05 Matsushita Electric Ind Co Ltd Reproducer of information recorded disk
JPS6313176A (en) * 1987-03-03 1988-01-20 Yamaha Corp Disk reproducing device
JPS6321270B2 (en) * 1987-03-03 1988-05-06 Yamaha Kk

Also Published As

Publication number Publication date
JPS5944694B2 (en) 1984-10-31

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