97 lines
3.0 KiB
Groff
97 lines
3.0 KiB
Groff
.\" $NetBSD: tu.4,v 1.14 2003/08/07 10:31:14 agc Exp $
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.\"
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.\" Copyright (c) 1980, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)tu.4 8.1 (Berkeley) 6/5/93
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.\"
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.Dd June 5, 1993
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.Dt TU 4 vax
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.Os
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.Sh NAME
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.Nm tu
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.Nd
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.Tn VAX-11/750
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.Tn TU-58
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console cassette interface
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.Sh DESCRIPTION
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The
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.Nm tu
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interface provides access to the
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.Tn VAX-11/750
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.Tn TU-58
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console cassette drive.
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.Pp
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The interface supports only block
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.Tn I/O
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to the
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.Tn TU-58
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cassettes.
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The devices are normally manipulated with the
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.Xr dd 1
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program.
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.Pp
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The device driver is automatically included when a
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system is configured to run on an 11/750.
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.Pp
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The
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.Tn TU-58
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on an 11/750 uses the Radial Serial Protocol
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.Pq Tn RSP
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to communicate with the cpu over a serial line. This
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protocol is inherently unreliable as it has no flow
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control measures built in.
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.Sh FILES
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.Bl -tag -width /dev/tu0xx -compact
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.It Pa /dev/tu0
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It tu%d: lost recv interrupt.
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.br
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A timer watching the controller detected no interrupt for
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an extended period while an operation was outstanding.
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This usually indicates that one or more receiver interrupts
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were lost and the transfer is restarted.
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.El
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.Sh HISTORY
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The
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.Nm
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driver appeared in
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.Bx 4.1 .
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.br
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A new driver showed up in
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.Nx 1.2 .
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.Sh BUGS
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The
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.Tn VAX-11/750
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console interface is unusable
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while the system is multi-user, because interrupts
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occur at a very high priority level (spl7) and cannot be blocked with splbio.
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Use this driver only when the system is running single-user and,
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even then, with caution.
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