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Annotation of researchv10dc/dist/man/v3/man5/tap.5, revision 1.1.1.1

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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