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Annotation of researchv10dc/dist/man/v3/man5/tap.5, revision 1.1

1.1     ! root        1: .pa 1
        !             2: .he 'TAP (V)'6/12/72'TAP (V)'
        !             3: .ti 0
        !             4: NAME           tap -- DEC/mag tape formats
        !             5: .sp
        !             6: .ti 0
        !             7: DESCRIPTION    The
        !             8: DECtape command tap___ and
        !             9: the magtape command mt__
        !            10: dump and extract files to and
        !            11: from their respective tape media.
        !            12: The formats of these tapes are the same except
        !            13: that magtapes have larger directories.
        !            14: .sp
        !            15: Block zero of the tape is not used.
        !            16: It is available to contain a boot program to be
        !            17: used in a stand-alone environment.
        !            18: This has proved valuable for DEC diagnostic programs.
        !            19: .sp
        !            20: Blocks 1 through 24
        !            21: for DECtape (1 through 146 for magtape)
        !            22: contain a directory of the tape.
        !            23: There are 192 (resp. 1168) entries in the directory;
        !            24: 8 entries per block;
        !            25: 64 bytes per entry.
        !            26: Each entry has the following format:
        !            27: .sp
        !            28: .in +3
        !            29: path name      32 bytes
        !            30: .br
        !            31: mode           1 byte
        !            32: .br
        !            33: uid            1 byte
        !            34: .br
        !            35: size           2 bytes
        !            36: .br
        !            37: time modified  4 bytes
        !            38: .br
        !            39: tape address   2 bytes
        !            40: .br
        !            41: unused         20 bytes
        !            42: .br
        !            43: check sum      2 bytes
        !            44: .sp
        !            45: .in -3
        !            46: The path name entry is the path name of the
        !            47: file when put on the tape.
        !            48: If the pathname starts with a zero word,
        !            49: the entry is empty.
        !            50: It is at most 32 bytes long and ends in a null byte.
        !            51: Mode, uid, size and time modified
        !            52: are the same as described under i-nodes (see file system (V))
        !            53: The tape address is the tape block number of the start of
        !            54: the contents of the file.
        !            55: Every file
        !            56: starts on a block boundary.
        !            57: The file occupies (size+511)/512 blocks
        !            58: of continuous tape.
        !            59: The checksum entry has a value such that
        !            60: the sum of the 32 words of the directory entry is zero.
        !            61: .sp
        !            62: Blocks 25 (resp. 147) on are available for file storage.
        !            63: .sp
        !            64: A fake entry (see mt(I), tap(I))
        !            65: has a size of zero.
        !            66: .sp
        !            67: .ti 0
        !            68: SEE ALSO       filesystem(V), mt(I), tap(I)

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