4.3BSD-UWisc/man/cat4/uu.4

UU(4)               UNIX Programmer's Manual                UU(4)



NAME
     uu - TU58/DECtape II UNIBUS cassette interface

SYNOPSIS
     options UUDMA
     device uu0 at uba0 csr 0176500 vector uurintr uuxintr

DESCRIPTION
     The _u_u device provides access to dual DEC TU58 tape car-
     tridge drives connected to the UNIBUS via a DL11-W interface
     module.

     The interface supports only block i/o to the TU58 cassettes.
     The drives are normally manipulated with the _a_r_f_f(8V) pro-
     gram using the ``m'' and ``f'' options.

     The driver provides for an optional write and verify (read
     after write) mode that is activated by specifying the ``a''
     device.

     The TU58 is treated as a single device by the system even
     though it has two separate drives, ``uu0'' and ``uu1''. If
     there is more than one TU58 unit on a system, the extra
     drives are named ``uu2'', ``uu3'' etc.

NOTES
     Assembly language code to assist the driver in handling the
     receipt of data (using a pseudo-dma approach) should be
     included when using this driver; specify ``options UUDMA''
     in the configuration file.

ERRORS
     The following errors may be returned:

     [ENXIO]     Nonexistent drive (on open); offset is too large
                 or bad (undefined) ioctl code.

     [EIO]       Open failed, the device could not be reset.

     [EBUSY]     Drive in use.

FILES
     /dev/uu?
     /dev/uu?a

SEE ALSO
     tu(4), arff(8V)

DIAGNOSTICS
     uu%d: no bp, active %d.  A transmission complete interrupt
     was received with no outstanding i/o request. This indicates
     a hardware problem.



Printed 12/27/86          May 15, 1985                          1






UU(4)               UNIX Programmer's Manual                UU(4)



     uu%d protocol error, state=%s, op=%x, cnt=%d, block=%d.  The
     driver entered an illegal state.  The information printed
     indicates the illegal state, the operation currently being
     executed, the i/o count, and the block number on the
     cassette.

     uu%d: break received, transfer restarted.  The TU58 was
     sending a continuous break signal and had to be reset. This
     may indicate a hardware problem, but the driver will attempt
     to recover from the error.

     uu%d receive state error, state=%s, byte=%x.  The driver
     entered an illegal state in the receiver finite state
     machine.  The state is shown along with the control byte of
     the received packet.

     uu%d: read stalled.  A timer watching the controller
     detected no interrupt for an extended period while an opera-
     tion was outstanding.  This usually indicates that one or
     more receiver interrupts were lost and the transfer is res-
     tarted.

     uu%d: hard error bn%d, pk_mod %o.  The device returned a
     status code indicating a hard error. The actual error code
     is shown in octal. No retries are attempted by the driver.






























Printed 12/27/86          May 15, 1985                          2