last one in the directory. Generally if more than one sector is
        used in the directory, you will find an rd at position 0. This
        represents a link to track 18 sector 4. A @ followed by a decimal
        255 represents the last sector of the directory. If when starting
        at track 18 sector 0 you cannot use the n key and link the
        directory sectors together, you will have to repair these pointer
        bytes. After a little practice, this task will become easy. Now
        for the file entries. Most changes can be made in the text mode.
        Program type is rarely corrupted and a @ at that position
        indicates a scratched file. These are normal and should remain
        scratched.
        
        The track and sector pointers must point to valid tracks and sectors
        or they are most likely dummy files meant to prevent file copying.
        Titles may have only upper and lower text in them. Those with text
        followed by other than a shifted space (decimal 160) should be
        filled with shifted spaces. Only occasionally will a program
        demand an unstandard file name. Finally, the number of sectors are
        not of major importance and will be normalized after file copying
        (when possible).

        Track 18 Sector 0 represents the BAM and is often corrupted
        also. The main spots are position 2 which is the DOS flag byte. A
        byte other than an A will prevent you from writing to that disk.
        Change this byte if not normal using the text mode. Position 144
        (decimal) represents the disk title and ID. These are in almost
        all cases, cosmetic and should be normalized. The title should be
        normal text and any unused title spaces should contain shifted
        spaces (decimal 160). The ID beginning at decimal position 162 can
        if desired, be 5 characters. These must however be normal text
        characters.

        Maps of normal sectors have been given. Use these maps and Disk
        Doctor to examine our Utility Disk. When you understand the normal
        format, the abnormal will become easy to fix.


            K.J. REVEALED TRILOGY    PAGE [65]     (C)1990 K.J.P.B.