JPS5454610A - Magnetic tape control system - Google Patents
Magnetic tape control systemInfo
- 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
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
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)
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 |
-
1977
- 1977-10-11 JP JP52121736A patent/JPS5944694B2/en not_active Expired
Cited By (7)
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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