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BSD 2.11 - man page for tp (bsd section 5)

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TP(5)											    TP(5)

NAME
       tp - DEC/mag tape formats

DESCRIPTION
       Tp dumps files to and extracts files from DECtape and magtape.  The formats of these tapes
       are the same except that magtapes have larger directories.

       Block zero contains a copy of a stand-alone bootstrap program.  See reboot(8).

       Blocks 1 through 24 for DECtape (1 through 62 for magtape)  contain  a  directory  of  the
       tape.   There  are 192 (resp. 496) entries in the directory; 8 entries per block; 64 bytes
       per entry.  Each entry has the following format:

	      struct {
		      char	      pathname[32];
		      unsigned short  mode;
		      char	      uid;
		      char	      gid;
		      char	      unused1;
		      char	      size[3];
		      long	      modtime;
		      unsigned short  tapeaddr;
		      char	      unused2[16];
		      unsigned short  checksum;
	      };

       The path name entry is the path name of the file when put on the tape.	If  the  pathname
       starts  with  a	zero word, the entry is empty.	It is at most 32 bytes long and ends in a
       null byte.  Mode, uid, gid, size and time modified are the same as described under i-nodes
       (see  file  system  fs(5)).  The tape address is the tape block number of the start of the
       contents of the file.   Every  file  starts  on	a  block  boundary.   The  file  occupies
       (size+511)/512  blocks  of  continuous tape.  The checksum entry has a value such that the
       sum of the 32 words of the directory entry is zero.

       Blocks above 25 (resp. 63) are available for file storage.

       A fake entry has a size of zero.

SEE ALSO
       fs(5), tp(1)

BUGS
       The pathname, uid, gid, and size fields are too small.

7th Edition				   May 15, 1985 				    TP(5)
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