.\" SCCSID: @(#)uu.4	8.1	9/11/90.TH uu 4 VAX "" Unsupported.SH Nameuu \- TU58/DECtape II UNIBUS cassette interface .SH Syntax.B "options UUDMA".br.B "device uu0 at uba0 csr 0176500 vector uurintr uuxintr".SH DescriptionThe.PN uudevice provides access to dual DEC TU58 tape cartridge drivesconnected to the UNIBUS via a DL11-W interface module..PPThe interface supports only block i/o to the TU58 cassettes.The drives are normally manipulated with the.MS arff 8vprogram using the .B m and .B f options..PPThe driver provides for an optional write and verify (read after write) mode that is activated by specifying the``a'' device..PPThe TU58 is treated as a single device by the system eventhough it has two separate drives, ``uu0'' and ``uu1''. If there is more than one TU58 unit on a system, the extra drivesare named ``uu2'', ``uu3'' etc..NTAssembly language code to assist the driver in handlingthe receipt of data (using a pseudo-dma approach) shouldbe included when using this driver; specify ``options UUDMA''in the configuration file..NE.SH DiagnosticsThe following errors may be returned:.TP 12[ENXIO]Nonexistent drive (on open); offset is too large or bad (undefined) ioctl code..TP[EIO]Open failed, the device could not be reset..TP[EBUSY]Drive in use..PP.BR "uu%d: no bp, active %d" ..brA transmission complete interrupt was received with no outstandingi/o request. This indicates a hardware problem..PP.BR "uu%d protocol error, state=%s, op=%x, cnt=%d, block=%d" ..brThe driver entered an illegal state.  The information printedindicates the illegal state, the operation currently being executed,the i/o count, and the block number on the cassette..PP.BR "uu%d: break received, transfer restarted" ..brThe TU58 was sending a continuous break signal and hadto be reset. This may indicate a hardware problem, butthe driver will attempt to recover from the error..PP.BR "uu%d receive state error, state=%s, byte=%x" ..brThe driver entered an illegal state in the receiver finitestate machine.  The state is shown along with the controlbyte of the received packet..PP.BR "uu%d: read stalled" ..brA timer watching the controller detected no interrupt foran extended period while an operation was outstanding.This usually indicates that one or more receiver interruptswere lost and the transfer is restarted..PP.BR "uu%d: hard error bn%d, pk_mod %o" ..brThe device returned a status code indicating a hard error. Theactual error code is shown in octal. No retries are attemptedby the driver..SH Files.PN /dev/uu?.br.PN /dev/uu?a.SH See Alsotu(4), arff(8V)