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WT(4)			    BSD Programmer's Manual			 WT(4)

NAME
     wt - Wangtek QIC-02 / QIC-36 streamer tape interface

SYNOPSIS
     wt0 at isa? port 0x300 bio irq 5 drq 1

DESCRIPTION
     The Wangtek QIC-02 / QIC-36 transport combination provides a subset of
     the standard tape drive interface as described in mtio(4).	 The driver
     supports QIC150 (150MB), QIC120 and QIC24 cartridges tapes.

     The device does not allow positioning the tape on specific blocks within
     files; opening the tape device will guarantee that the tape is at the be-
     ginning of a file (or at the beginning of unrecorded media).  On open,
     the tape will be rewound (if the cartridge was changed) or positioned af-
     ter the file mark of the last file read/written (if non-rewinding mode
     was used).	 The mtio(4) operations MTFSR, MTBSR, MTCACHE and MTNOCACHE
     are not supported (the first two will generate an error condition).

     The modes of tape's operation (rewinding/non-rewinding and density selec-
     tion) are encoded in the minor device number as following (for the tape
     drive 0):

	   003	   unit select
	     0	   unit zero
	     1	   unit one

	   004	   no rewind

	   030	   density select
	    0	   QIC150
	    1	   QIC120
	    2	   QIC24

DIAGNOSTICS
     wt0: write protected  An attempt was made to write on the tape drive when
     the write protection switch was in "safe" position; this message is writ-
     ten on the terminal of the user who tried to access the tape.

     wt0: no tape inserted  An attempt was made to access the tape while there
     was no tape cartridge inserted into the drive; this message is written on
     the terminal of the user who tried to access the tape.

     wt0: illegal command
     wt0: drive not online
     wt0: read status failed  A hardware failure of undefined nature occurred;
     this "cannot happen" on properly operated device.	Sometimes these mes-
     sages can be generated if the user tried to remove or handle tape car-
     tridge while an operation was in progress.	 These messages will be writ-
     ten on the terminal of the user who tried to read or write the tape.

     wt0: unrecoverable data error  An unrecoverable data error occurred while
     reading or writing the tape; usually it means that the tape is bad or
     that the user is trying to read unrecorded tape.  The drive tries to re-
     cover from data errors; if this message appears it is useless to retry
     reading or writing any further.  This message is written on the terminal
     of the user who tried to access the tape.

     wt0: no data detected  An attempt was made to read past recorded data or
     the tape is bad; this error is fatal and it's useless to retry reading.
     This message is written on the terminal of the user who tried to read the
     tape.

     wt0: block not located  An unrecoverable error occurred while reading the
     tape; usually it means that the tape was not recorded properly or is bad;
     this error is fatal.  This message is written on the terminal of the user
     who tried to read the tape.

     wt0: end of recorded media	 An attempt was made to read past recorded da-
     ta or read or write past the end of tape; this error is fatal.  This mes-
     sage is written on the terminal of the user who tried to read the tape.

     wt0: hit end of tape  End of tape was reached during reading or writing
     tape with continuation mode disabled. This error is fatal and the opera-
     tion cannot be continued; the tape should be rewound first.  This message
     is written on the terminal of the user who was writing the tape.

     wt0: bad DRQ number %d (hardware supports only 1-3)  There is an error in
     the system configuration; the system administrator should correct the
     configuration and recompile the kernel. This message is written on con-
     sole during bootstrapping the system.

     wt0: strategy  A user tried to access the tape through block device in-
     terface; the system administrator should remove the special files in or-
     der to prevent printing this message in future. This message is written
     on console.

     wt0: extra interrupt
     wt0: bogus interrupt  These messages can appear spontaneously; usually as
     a result of minor faults in device hardware or bus interface. Ignore
     these messages if they aren't frequent; frequently occurrence of these
     messages is a sign of a hardware fault or hardware configuration problems
     like assigning the same IRQ to the multiple devices. These message are
     written on console.

FILES
     /dev/rwt[0-1]_q150	  auto rewind on close QIC150
     /dev/rwt[0-1]_q120	  auto rewind on close QIC120
     /dev/rwt[0-1]_q24	  auto rewind on close QIC24
     /dev/nrwt[0-1]_q150  no rewind on close QIC150
     /dev/nrwt[0-1]_q120  no rewind on close QIC120
     /dev/nrwt[0-1]_q24	  no rewind on close QIC24
     /dev/rwt[0-1]	  alias for /dev/rwt[0-1]_q150
     /dev/nrwt[0-1]	  alias for /dev/nrwt[0-1]_q150
     /dev/rwt[4-5]	  alias for /dev/nrwt[0-1]_q150

BUGS
     The 125MB tape format is not supported.

4th Berkeley Distribution      January 14, 1994				     2
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