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Annotation of researchv10dc/dist/man/v4/man5/tp.5, revision 1.1.1.1

1.1       root        1: .th TP V 9/10/73
                      2: .sh NAME
                      3: tp \*- DEC/mag tape formats
                      4: .sh DESCRIPTION
                      5: The
                      6: command
                      7: .it tp
                      8: dumps and extracts files to and
                      9: DECtape and magtape.
                     10: The formats of these tapes are the same except
                     11: that magtapes have larger directories.
                     12: .s3
                     13: Block zero contains a
                     14: copy of a stand-alone bootstrap program.
                     15: See boot procedures (VIII).
                     16: .s3
                     17: Blocks 1 through 24
                     18: for DECtape (1 through 62 for magtape)
                     19: contain a directory of the tape.
                     20: There are 192 (resp. 496) entries in the directory;
                     21: 8 entries per block;
                     22: 64 bytes per entry.
                     23: Each entry has the following format:
                     24: .s3
                     25: .lp +24 20
                     26: path name      32 bytes
                     27: .lp +24 20
                     28: mode   2 bytes
                     29: .lp +24 20
                     30: uid    1 byte
                     31: .lp +24 20
                     32: gid    1 byte
                     33: .lp +24 20
                     34: unused 1 byte
                     35: .lp +24 20
                     36: size   3 bytes
                     37: .lp +24 20
                     38: time modified  4 bytes
                     39: .lp +24 20
                     40: tape address   2 bytes
                     41: .lp +24 20
                     42: unused 16 bytes
                     43: .lp +24 20
                     44: check sum      2 bytes
                     45: .s3
                     46: .i0
                     47: The path name entry is the path name of the
                     48: file when put on the tape.
                     49: If the pathname starts with a zero word,
                     50: the entry is empty.
                     51: It is at most 32 bytes long and ends in a null byte.
                     52: Mode, uid, gid, size and time modified
                     53: are the same as described under i-nodes (file system (V)).
                     54: The tape address is the tape block number of the start of
                     55: the contents of the file.
                     56: Every file
                     57: starts on a block boundary.
                     58: The file occupies (size+511)/512 blocks
                     59: of continuous tape.
                     60: The checksum entry has a value such that
                     61: the sum of the 32 words of the directory entry is zero.
                     62: .s3
                     63: Blocks 25 (resp. 63) on are available for file storage.
                     64: .s3
                     65: A fake entry (see tp(I))
                     66: has a size of zero.
                     67: .sh "SEE ALSO"
                     68: file system(V), tp(I)

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