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Annotation of 43BSDTahoe/man/man4/vax/va.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: .\"    @(#)va.4        6.2 (Berkeley) 5/14/86
        !             6: .\"
        !             7: .TH VA 4 "May 14, 1986"
        !             8: .UC 4
        !             9: .SH NAME
        !            10: va \- Benson-Varian interface
        !            11: .SH SYNOPSIS
        !            12: .B "controller va0 at uba0 csr 0164000 vector vaintr"
        !            13: .br
        !            14: .B "disk vz0 at va0 drive 0"
        !            15: .SH DESCRIPTION
        !            16: (\fBNOTE: the configuration description, while counter-intuitive,
        !            17: is actually as shown above\fP.)
        !            18: .PP
        !            19: The Benson-Varian printer/plotter in normally used with the line printer
        !            20: system.
        !            21: This description is designed for those who wish to drive the Benson-Varian
        !            22: directly.
        !            23: .PP
        !            24: In print mode, the Benson-Varian uses a modified ASCII character set.
        !            25: Most control characters print various non-ASCII graphics such as daggers,
        !            26: sigmas, copyright symbols, etc.
        !            27: Only LF and FF are used as format effectors.  LF acts as a newline,
        !            28: advancing to the beginning of the next line, and FF advances to the top of
        !            29: the next page.
        !            30: .PP
        !            31: In plot mode, the Benson-Varian prints one raster line at a time.
        !            32: An entire raster line of bits (2112 bits = 264 bytes) is sent, and
        !            33: then the Benson-Varian advances to the next raster line.
        !            34: .PP
        !            35: .B Note:
        !            36: The Benson-Varian must be sent an even number of bytes.
        !            37: If an odd number is sent, the last byte will be lost.
        !            38: Nulls can be used in print mode to pad to an even number of bytes.
        !            39: .PP
        !            40: To use the Benson-Varian yourself,
        !            41: you must realize that you cannot open the device,
        !            42: .I /dev/va0
        !            43: if there is a daemon active.
        !            44: You can see if there is an active daemon by doing a
        !            45: .IR lpq (1)
        !            46: and seeing if there are any files being printed.
        !            47: Printing should be turned off using
        !            48: .IR lpc (8).
        !            49: .PP
        !            50: To set the Benson-Varian into plot mode include the file
        !            51: .RI < sys/vcmd.h >
        !            52: and use the following
        !            53: .IR ioctl (2)
        !            54: call
        !            55: .IP
        !            56: ioctl(fileno(va), VSETSTATE, plotmd);
        !            57: .PP
        !            58: where
        !            59: .I plotmd
        !            60: is defined to be
        !            61: .IP
        !            62: \fBint\fR plotmd[] = { VPLOT, 0, 0 };
        !            63: .PP
        !            64: and
        !            65: .I va
        !            66: is the result of a call to
        !            67: .I fopen
        !            68: on stdio.
        !            69: When you finish using the Benson-Varian in plot mode you should advance to
        !            70: a new page
        !            71: by sending it a FF after putting it back into print mode, i.e. by
        !            72: .PP
        !            73: 'nf
        !            74:        \fBint\fR prtmd[] = { VPRINT, 0, 0 };
        !            75:        \&...
        !            76:        fflush(va);
        !            77:        ioctl(fileno(va), VSETSTATE, prtmd);
        !            78:        write(fileno(va), "\ef\e0", 2);
        !            79: .fi
        !            80: .SH FILES
        !            81: /dev/va0
        !            82: .SH SEE ALSO
        !            83: vfont(5),
        !            84: lpr(1),
        !            85: lpd(8),
        !            86: vp(4)
        !            87: .SH DIAGNOSTICS
        !            88: The following error numbers are significant at the
        !            89: time the device is opened.
        !            90: .TP 10
        !            91: [ENXIO]
        !            92: The device is already in use.
        !            93: .TP
        !            94: [EIO]
        !            95: The device is offline.
        !            96: .PP
        !            97: The following message may be printed on the console.
        !            98: .PP
        !            99: \fBva%d: npr timeout\fR.  The device was not able to get data from
        !           100: the UNIBUS within the timeout period, most likely because some other
        !           101: device was hogging the bus.  (But see BUGS below).
        !           102: .SH BUGS
        !           103: The 1's (one's) and l's (lower-case el's) in the Benson-Varian's
        !           104: standard character set look very similar; caution is advised.
        !           105: .PP
        !           106: The interface hardware is rumored to have problems which can
        !           107: play havoc with the UNIBUS.  We have intermittent minor problems on the
        !           108: UNIBUS where our
        !           109: .I va
        !           110: lives, but haven't ever been able to pin them down
        !           111: completely.

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