JPS5698708A - Magnetic tape control system - Google Patents
Magnetic tape control systemInfo
- Publication number
- JPS5698708A JPS5698708A JP14980A JP14980A JPS5698708A JP S5698708 A JPS5698708 A JP S5698708A JP 14980 A JP14980 A JP 14980A JP 14980 A JP14980 A JP 14980A JP S5698708 A JPS5698708 A JP S5698708A
- Authority
- JP
- Japan
- Prior art keywords
- tape
- written
- dbs
- instruction
- channel
- 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
Links
Landscapes
- Error Detection And Correction (AREA)
Abstract
PURPOSE: To detect abnormal erasure of DB and double writing by counting the number of data block (DB) recorded on a tape until the tape is stopped and by comparing the count value with the number of written DBs that a host device stores.
CONSTITUTION: In response to write instruction C1 from channel 3, data S1 is sent to tape device 1 via buffer 26 and modulator 25 and written on a tape as various DBs. Similarly, a tape mark is written with tape mark write instruction C1. Written DBs are read out with a read instruction and then transferred to channel 3 via demodulator 21, buffer 22 and OR27. On arrival of a space file instruction, tape device 1 is driven to discriminate between DB and the tape mark. In case of DB, it is counted 21 and in case of the tape mark, on the other hand, the driving is stopped. In response to a count read instruction, count value 21 is transferred to channel 3 via OR27 and then compared with the previously stored number of written DBs.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14980A JPS5698708A (en) | 1980-01-07 | 1980-01-07 | Magnetic tape control system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14980A JPS5698708A (en) | 1980-01-07 | 1980-01-07 | Magnetic tape control system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5698708A true JPS5698708A (en) | 1981-08-08 |
Family
ID=11465971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14980A Pending JPS5698708A (en) | 1980-01-07 | 1980-01-07 | Magnetic tape control system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5698708A (en) |
-
1980
- 1980-01-07 JP JP14980A patent/JPS5698708A/en active Pending
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