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Annotation of 43BSDTahoe/man/man4/vax/tu.4, revision 1.1

1.1     ! root        1: .\" Copyright (c) 1980 Regents of the University of California.
        !             2: .\" All rights reserved.  The Berkeley software License Agreement
        !             3: .\" specifies the terms and conditions for redistribution.
        !             4: .\"
        !             5: .\"    @(#)tu.4        6.1 (Berkeley) 5/15/85
        !             6: .\"
        !             7: .TH TU 4 "May 15, 1985"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: tu \- VAX-11/730 and VAX-11/750 TU58 console cassette interface
        !            11: .SH SYNOPSIS
        !            12: .B "options MRSP"
        !            13: (for VAX-11/750's with an MRSP prom)
        !            14: .SH DESCRIPTION
        !            15: The
        !            16: .I tu
        !            17: interface provides access to the VAX 11/730 and 11/750 TU58 console
        !            18: cassette drive(s).  
        !            19: .PP
        !            20: The interface supports only block i/o to the TU58 cassettes.
        !            21: The devices are normally manipulated with the 
        !            22: .IR arff (8V)
        !            23: program using the ``f'' and ``m'' options.
        !            24: .PP
        !            25: The device driver is automatically included when a
        !            26: system is configured to run on an 11/730 or 11/750.
        !            27: .PP
        !            28: The TU58 on an 11/750 uses the Radial Serial Protocol (RSP)
        !            29: to communicate with the cpu over a serial line.  This 
        !            30: protocol is inherently unreliable as it has no flow
        !            31: control measures built in.  On an 11/730 the Modified
        !            32: Radial Serial Protocol is used.  This protocol incorporates
        !            33: flow control measures which insure reliable data transfer
        !            34: between the cpu and the device.  Certain 11/750's have
        !            35: been modified to use the MRSP prom used in the 11/730.
        !            36: To reliably use the console TU58 on an 11/750 under UNIX,
        !            37: the MRSP prom is required.  For those 11/750's without
        !            38: an MRSP prom, an unreliable but often
        !            39: useable interface has been developed.
        !            40: This interface uses an assembly language ``pseudo-dma'' routine
        !            41: to minimize the receiver interrupt service latency.
        !            42: To include this code in
        !            43: the system, the configuration must \fBnot\fP specify the
        !            44: system will run on an 11/730 or use an MRSP prom.
        !            45: This unfortunately makes it impossible to configure a
        !            46: single system which will properly handle TU58's on both an 11/750
        !            47: and an 11/730 (unless both machines have MRSP proms).
        !            48: .SH FILES
        !            49: .nf
        !            50: .DT
        !            51: /dev/tu0
        !            52: /dev/tu1       (only on a VAX-11/730)
        !            53: .fi
        !            54: .SH "SEE ALSO"
        !            55: arff(8V)
        !            56: .SH DIAGNOSTICS
        !            57: .BR "tu%d: no bp, active %d" .
        !            58: A transmission complete interrupt was received with no outstanding
        !            59: i/o request.  This indicates a hardware problem.
        !            60: .PP
        !            61: .BR "tu%d protocol error, state=%s, op=%x, cnt=%d, block=%d" .
        !            62: The driver entered an illegal state.  The information printed
        !            63: indicates the illegal state, operation currently being executed,
        !            64: the i/o count, and the block number on the cassette.
        !            65: .PP
        !            66: .BR "tu%d receive state error, state=%s, byte=%x" .
        !            67: The driver entered an illegal state in the receiver finite
        !            68: state machine.  The state is shown along with the control
        !            69: byte of the received packet.
        !            70: .PP
        !            71: .BR "tu%d: read stalled" .
        !            72: A timer watching the controller detected no interrupt for
        !            73: an extended period while an operation was outstanding.
        !            74: This usually indicates that one or more receiver interrupts
        !            75: were lost and the transfer is restarted (11/750 only).
        !            76: .PP
        !            77: .BR "tu%d: hard error bn%d, pk_mod %o" .
        !            78: The device returned a status code indicating a hard error. The
        !            79: actual error code is shown in octal. No retries are attempted
        !            80: by the driver.
        !            81: .SH BUGS
        !            82: The VAX-11/750 console interface without MRSP prom is unuseable
        !            83: while the system is multi-user; it should be used only with
        !            84: the system running single-user and, even then, with caution.

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