cdc_6500_survival_guide
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cdc_6500_survival_guide [2021/03/15 23:28] – [File System] hc9 | cdc_6500_survival_guide [2022/02/25 06:11] – [Program source files] hc9 | ||
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* 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 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. | ||
* Two types of files are supported: | * Two types of files are supported: | ||
- | |||
* **Direct access** | * **Direct access** | ||
* Used for random access and database applications. | * Used for random access and database applications. | ||
- | |||
* **Indirect access** | * **Indirect access** | ||
* Common sequential access files, including program source files. | * Common sequential access files, including program source files. | ||
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Each programming subsystem includes a simple editing function for entering and modifying program source code in the primary file as follows: | Each programming subsystem includes a simple editing function for entering and modifying program source code in the primary file as follows: | ||
- | To add a source code line:Type a new line sequence number followed by a space and then a program statement. Source code lines will be stored and compiled/ | + | |To add a source code line:| |
+ | |Type a new line sequence number followed by a space and then a program statement. Source code lines will be stored and compiled/ | ||
+ | |||
+ | |To modify a source code line:| | ||
+ | |Type line sequence number of the program statement to be changed followed by a space and the modified program statement.| | ||
+ | |||
+ | |To delete a source code line:| | ||
+ | |Type the line sequence number followed immediately by the '' | ||
* In the BASIC subsystem, use line sequence numbers as the targets of '' | * In the BASIC subsystem, use line sequence numbers as the targets of '' |
cdc_6500_survival_guide.txt · Last modified: 2022/12/05 06:33 by hc9