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Unix Version 7 - man page for tp (v7 section 5)

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TP(5)											    TP(5)

       tp - DEC/mag tape formats

       The command 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 bproc(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];
		   int	mode;
		   char uid;
		   char gid;
		   char unused1;
		   char size[3];
		   long modtime;
		   int	tapeaddr;
		   char unused2[16];
		   int	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  filsys(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.

       filsys(5), tp(1)

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

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