qt(7)                            UNIX System V                            qt(7)


NAME
      qt - QIC cartridge magnetic tape streamer interface

SYNOPSIS
      qt

DESCRIPTION
      The format for tape files is described below:

            /dev/rmt/c0s0n    no rewind on close, no retension on open
            /dev/rmt/c0s0     rewind on close, no retension on open
            /dev/rmt/c0s0nr   no rewind on close, retension on open
            /dev/rmt/c0s0r    rewind on close, retension on open

      These files refer to the Wangtek PC-36 Controller and the QIC-24/QIC-02
      basic cartridge tape streamer.  Only raw character interface files are
      provided.  When opened for reading or writing, the tape is assumed to be
      positioned as desired.  If the file was retension-on-open, the tape is
      retensioned before any I/O is performed.  When a TRWD, TRETENSION,
      TLOAD, or TUNLOAD ioctl is requested after a write, a double end-of-
      file (double tape mark) is written before the ioctl is executed.  When a
      rewind-on-close file is closed, a double end-of-file (double tape mark)
      is written if the file was opened for writing and data was written.  When
      a rewind-on-close file is closed, the tape is rewound.  If the file is
      no-rewind-on-close and was opened for writing and data was written, only
      one EOF is written, and the tape is positioned after the EOF just
      written.  If the file was no-rewind and the file was opened for read-
      only, the tape is positioned after the EOF following the data just read.
      The EOF is returned as a zero-length read.  By judiciously choosing qt
      files, it is possible to read and write multi-file tapes.

      A standard tape consists of several 512-byte records terminated by an
      EOF.  To the extent possible, the system treats the tape like any other
      file.  As in other raw devices, seeks are ignored.  An EOF is returned as
      a zero-length read, with the tape positioned after the EOF, so that the
      next read will return the next record.

      Only one process is permitted to have any of the tape files open at a
      given time to the extent it is enforceable.  Writing after reading is
      permitted, but reading after writing without an intervening rewind is
      not.  If ONDELAY is clear, opening a retension-on-open file will block
      until the retension is complete.  If ONDELAY is set, open will return
      without delay.  Opening a file with OAPPEND set is an error (EINVAL).

      The following ioctl's are supported:

            TRETENSION    retension the tape
            TRWD          rewind the tape to BOT
            TLOAD         rewind the tape to BOT
            TUNLOAD       rewind the tape to BOT




10/89                                                                    Page 1

qt(7)                            UNIX System V                            qt(7)


            TERASE        erase the tape and leave it at BOT
            TWRFILEM      write an EOF (tape mark)
            TRST          reset the tape device
            TSFF          skip forward arg files
            TSBF          skip forward arg blocks
            TRDSTAT       read the device status registers into the buffer
                           pointed to by arg.
            TSFREC        seek Forward a Record
            TSBREC        seek Backward a Record
            TTINIT        initialize Tape Interface
            TRDBLKLEN     read Block Size
            TWRBLKLEN     set Block Size
            TPREVMV       prevent Media Removal
            TALLOMV       allow Media Removal
            TSBB          space Blocks Backwards
            TSFB          space Filemarks Backwards
            TEOD          space to End Of Data
            TSSFB         space Sequential Filemarks Backwards
            TSSFF         space Sequential Filemarks Forward
            TSTS          set Tape Speed (1600/6250 bpi etc.)
            TSTD          set Tape Density (QIC-120/150 etc.)

FILES
      /dev/rmt/c0s0n
      /dev/rmt/c0s0
      /dev/rmt/c0s0nr
      /dev/rmt/c0s0r

SEE ALSO
      intro(7),

      tape(1) in the User's Reference Manual






















Page 2                                                                    10/89