GB1529583A - Data processing system - Google Patents
Data processing systemInfo
- Publication number
- GB1529583A GB1529583A GB40810/75A GB4081075A GB1529583A GB 1529583 A GB1529583 A GB 1529583A GB 40810/75 A GB40810/75 A GB 40810/75A GB 4081075 A GB4081075 A GB 4081075A GB 1529583 A GB1529583 A GB 1529583A
- Authority
- GB
- United Kingdom
- Prior art keywords
- disc
- data
- command
- words
- controller
- 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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
- G06F12/14—Protection against unauthorised use of memory or access to memory
- G06F12/1458—Protection against unauthorised use of memory or access to memory by checking the subject access rights
- G06F12/1466—Key-lock mechanism
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/06—Digital input from, or digital output to, record carriers, e.g. RAID, emulated record carriers or networked record carriers
- G06F3/0601—Interfaces specially adapted for storage systems
- G06F3/0668—Interfaces specially adapted for storage systems adopting a particular infrastructure
- G06F3/0671—In-line storage system
- G06F3/0673—Single storage device
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
1529583 Data processing system XEROX CORP 6 Oct 1975 [29 Oct 1974] 40810/75 Heading G4A The description is similar to that of Specification 1,529,581 except that it contains additional material relating to the disc store controller. The claims relate to a microprogram controlled disc system including a disc controller operated under microprogram control, each command being verified as valid before being executed. The disc controller operates under microprogram control to read data from and write data on to a disc storage system including one or more double-sided discs. Three independent data blocks are recorded in each recording position along a disc track, the first two words including the address, the next eight words being a label, and the remaining 256 words being data. The data may be checked by comparison with that in the main data store except that certain words may be omitted from the checking in order to permit read and checking operations to be combined. A four word block in the main memory includes a pointer to a chain of disc commands, the controller idling when the pointer is empty, i.e. O. The disc commands consist of ten words which include a pointer to the next command, O indicating that this is the last command, status data, the command, disc address data, pointers indicating the location, or required location, in the main memory of the data, and words controlling the initiation of interrupts when the command has been completed. Each command accessed is verified as valid by comparing it with a verification word stored in a constant memory defore being executed. The discs are divided into sectors, e.g. 12 per track and sector and word signals are used to interrupt the microprogram (task switching, see Specification 1,529,581) in order to keep track of the addressing of the disc. Error signals also cause interrupts. The Specification gives some detail of the various circuits used in the disc controller.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US51855574A | 1974-10-29 | 1974-10-29 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1529583A true GB1529583A (en) | 1978-10-25 |
Family
ID=24064451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB40810/75A Expired GB1529583A (en) | 1974-10-29 | 1975-10-06 | Data processing system |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1529583A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117946A (en) * | 1982-04-05 | 1983-10-19 | Tallgrass Techn Corp | Method and apparatus for magnetic storage and retrieval of information |
US4584616A (en) * | 1984-07-12 | 1986-04-22 | Tallgrass Technologies Corporation | Format for storing data on magnetic media |
-
1975
- 1975-10-06 GB GB40810/75A patent/GB1529583A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2117946A (en) * | 1982-04-05 | 1983-10-19 | Tallgrass Techn Corp | Method and apparatus for magnetic storage and retrieval of information |
US4584616A (en) * | 1984-07-12 | 1986-04-22 | Tallgrass Technologies Corporation | Format for storing data on magnetic media |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
746 | Register noted 'licences of right' (sect. 46/1977) | ||
PCNP | Patent ceased through non-payment of renewal fee |