MS-DOS - FSR


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  • How does MS-DOS allocate 0fffh paragraphs?

    The following steps describe this process: 1. The formatted part of the header is read into memory. Its size is 1BH. 2. MS-DOS allocates a portion of memory depending on the size of the load module and the allocation numbers (AH-BH and CH-DH). MS-DOS then attempts to allocate 0FFFH paragraphs.

  • What is a subdirectory in MS-DOS?

    While MS-DOS retains the original fixed-size main directory, it now can have files as subdirectories. This hierarchical (tree-structured) directory system may be extended to any depth. This approach is nearly essential for users to keep track of all the files that might be on a hard disk.

  • What is reserved in MS-DOS 4.0?

    Reserved is eight bytes of zeros. Number of pointers is the number of information pointers in the header. For MS-DOS 4.0, the value of this word should be 1. Type of pointer is the type of information pointers in the header. For MS-DOS 4.0, the value of this word should be 1.

  • Why do I need to inform MS-DOS when opening a file?

    When opening a file, it is important to inform MS-DOS of any operations that other processes may perform on this file (sharing mode). The default (compatibility mode) denies all other processes access to the file, unless they also attempt to open the file in compatibility mode.

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