GB892057A - Improvements in or relating to the magnetic storage of information - Google Patents
Improvements in or relating to the magnetic storage of informationInfo
- Publication number
- GB892057A GB892057A GB1446758A GB1446758A GB892057A GB 892057 A GB892057 A GB 892057A GB 1446758 A GB1446758 A GB 1446758A GB 1446758 A GB1446758 A GB 1446758A GB 892057 A GB892057 A GB 892057A
- Authority
- GB
- United Kingdom
- Prior art keywords
- supervisory circuit
- writing
- power failure
- circuit
- power
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
Landscapes
- Digital Magnetic Recording (AREA)
Abstract
892,057. Magnetic recording &c. apparatus; monitoring. BRITISH TELECOMMUNICATIONS RESEARCH Ltd. April 20, 1959 [May 6, 1958], No. 14467/58. Class 40 (2). [Also in Group XIX] The control equipment for a magnetic drum digital data store has a supervisory circuit operated in the event of power failure to prevent the start of a new processing operation, a power reserve (e.g. a large capacitor) enabling completion of the current operation and operation of the supervisory circuit. An electromagnetic relay may be used in the supervisory circuit, which may be sensitive to a rate of fall of the power supply voltage normally attributable only to power failure. Fig. 7 shows part of the writing circuit comprising a transformer TR2, the secondary of which drives the recording head and having two primary windings for binary 0 and 1) energized oppositely by transistors T2, T3. Writing is inhibited by cutting off series transistor T1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1446758A GB892057A (en) | 1958-05-06 | 1958-05-06 | Improvements in or relating to the magnetic storage of information |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1446758A GB892057A (en) | 1958-05-06 | 1958-05-06 | Improvements in or relating to the magnetic storage of information |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB892057A true GB892057A (en) | 1962-03-21 |
Family
ID=10041722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1446758A Expired GB892057A (en) | 1958-05-06 | 1958-05-06 | Improvements in or relating to the magnetic storage of information |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB892057A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5057419U (en) * | 1973-09-25 | 1975-05-29 | ||
| JPS5294111A (en) * | 1976-02-04 | 1977-08-08 | Hitachi Ltd | Data recording unit |
-
1958
- 1958-05-06 GB GB1446758A patent/GB892057A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5057419U (en) * | 1973-09-25 | 1975-05-29 | ||
| JPS5294111A (en) * | 1976-02-04 | 1977-08-08 | Hitachi Ltd | Data recording unit |
| JPS5922287B2 (en) * | 1976-02-04 | 1984-05-25 | 株式会社日立製作所 | information recording device |
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