cdc_6500_survival_guide
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cdc_6500_survival_guide [2021/03/15 23:07] – [Text Editor] hc9 | cdc_6500_survival_guide [2021/03/15 23:28] – [File System] hc9 | ||
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A basic understanding of the 6500 file system is necessary to use most IAF comands. | A basic understanding of the 6500 file system is necessary to use most IAF comands. | ||
- | **Permanent files** Permanent files are preserved by the system from their creation until their deletion by user command. Each permanent file is owned by a single user and is normally accessible only by its owner, though it is possible to make files accessible by other users as well. | + | * **Permanent files** |
+ | | ||
+ | * Two types of files are supported: | ||
- | Two types of files are supported: | + | * **Direct access** |
+ | * Used for random access and database applications. | ||
- | **Direct | + | |
+ | * Common sequential | ||
- | **Indirect access** Common sequential | + | |
+ | * Whenever an indirect | ||
+ | * A temporary file is //not// created when a //direct access// file is opened. Changes made to a direct access file are immediately applied to the permanent file. | ||
- | **Temporary files** Whenever an indirect access | + | |
+ | * The primary | ||
+ | * The currently selected primary | ||
- | A temporary file is //not// created when a //direct access// file is opened. Changes made to a direct access file are immediately applied to the permanent file. | + | |
- | + | | |
- | **Primary file** The primary file is the temporary file, usually a program source file, that a user is viewing, modifying, or executing at a given time. Although a user session may simultaneously open multiple temporary | + | |
- | + | ||
- | The currently selected primary file automatically determines the user's active subsystem. When a new indirect access file is saved as a permanent file for the first time, the file system records the active subsystem at the time. Then when the file is selected as primary sometime later, the system automatically activates the original subsystem. | + | |
- | + | ||
- | **Local files** Local files are the set of temporary files and direct access files (permanent files) currently open by a particular job or user session. | + | |
File names my be up to seven alphanumeric (upper-case) characters and may not begin with a numeric character. The following file names are reserved by the system: | File names my be up to seven alphanumeric (upper-case) characters and may not begin with a numeric character. The following file names are reserved by the system: | ||
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Use the ACCESS subsystem to communicate with other users connected to the 6500. | Use the ACCESS subsystem to communicate with other users connected to the 6500. | ||
- | | "ACCESS" | + | | '' |
| Enter the ACCESS subsystem | | | Enter the ACCESS subsystem | | ||
- | | "USER,"//userID// | Find connected user's terminal port number | | + | | '' |
- | | "DIAL,"//port//","//message// | Send message to user. | | + | | '' |
===== Other System Commands ===== | ===== Other System Commands ===== | ||
- | | "DAYFILE" | + | | '' |
- | | "PASSWOR,"//old//","//new// | Change user password from //old// to //new// | | + | | '' |
===== Disconnecting ===== | ===== Disconnecting ===== | ||
- | | "BYE"\\ "GOODBYE"\\ "LOGOUT" | + | | '' |
- | | "HELLO"\\ "LOGIN" | + | | '' |
===== File Sharing ===== | ===== File Sharing ===== | ||
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Share permanent files with other 6500 users. | Share permanent files with other 6500 users. | ||
- | | "CHANGE,"//file//"/CT=PU,M="//mode// | Give access mode //mode// to //file// to all 6500 users. \\ Permission // | + | | '' |
- | | "PERMIT,"//file//","//user//["="// | + | | '' |
- | | "CATLIST,UN="//user// | List permanent files in // | + | | '' |
- | | "OLD,"//file//"/UN="//user// | Open permanent file //file// in // | + | | '' |
===== File Transfer ===== | ===== File Transfer ===== |
cdc_6500_survival_guide.txt · Last modified: 2022/12/05 06:33 by hc9