1 .\" $NetBSD: uu.4,v 1.10 2003/05/03 18:10:40 wiz Exp $
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30 .\" from: @(#)uu.4 8.1 (Berkeley) 6/5/93
38 .Tn TU-58 Ns / Ns Tn DECtape II UNIBUS
42 .Cd "uu0 at uba0 csr 0176500 vector uurintr uuxintr"
44 NOTE: This driver has not been ported from
50 device provides access to dual
60 The interface supports only block
66 The drives are normally manipulated with the
68 program using the ``m'' and ``f'' options.
70 The driver provides for an optional write and verify
71 (read after write) mode that is activated by specifying the
76 is treated as a single device by the system even
77 though it has two separate drives,
84 unit on a system, the extra drives
90 Assembly language code to assist the driver in handling
91 the receipt of data (using a pseudo-DMA approach) should
92 be included when using this driver; specify
94 in the configuration file.
96 .Bl -tag -width /dev/uu?a -compact
102 .It uu%d: no bp, active %d.
103 A transmission complete interrupt was received with no outstanding
105 request. This indicates a hardware problem.
107 .It uu%d protocol error, state=%s, op=%x, cnt=%d, block=%d.
108 The driver entered an illegal state. The information printed
109 indicates the illegal state, the
110 operation currently being executed,
113 count, and the block number on the cassette.
115 .It uu%d: break received, transfer restarted.
118 was sending a continuous break signal and had
119 to be reset. This may indicate a hardware problem, but
120 the driver will attempt to recover from the error.
122 .It uu%d receive state error, state=%s, byte=%x.
123 The driver entered an illegal state in the receiver finite
124 state machine. The state is shown along with the control
125 byte of the received packet.
127 .It uu%d: read stalled.
128 A timer watching the controller detected no interrupt for
129 an extended period while an operation was outstanding.
130 This usually indicates that one or more receiver interrupts
131 were lost and the transfer is restarted.
133 .It uu%d: hard error bn%d, pk_mod %o.
134 The device returned a status code indicating a hard error. The
135 actual error code is shown in octal. No retries are attempted
139 The following errors may be returned:
140 .Bl -tag -width [ENXIO]
142 Nonexistent drive (on open);
143 offset is too large or bad (undefined)
147 Open failed, the device could not be reset.