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Annotation of researchv10dc/man/manb/vp.4, revision 1.1.1.1

1.1       root        1: .TH VP 4 2/21/80 4
                      2: .UC 4
                      3: .SH NAME
                      4: vp \- Versatec interface
                      5: .SH SYNOPSIS
                      6: .B #include <sys/vcmd.h>
                      7: .SH DESCRIPTION
                      8: The Versatec printer/plotter in normally used with the programs
                      9: .IR vpr (1),
                     10: .IR vprint (1)
                     11: or
                     12: .IR vtroff (1).
                     13: This description is designed for those who wish to drive the Versatec directly.
                     14: .PP
                     15: The Versatec at Berkeley is 36\*(rq wide, and has 440 characters per line
                     16: and 7040 dots per line in plot mode (this is actually slightly less than
                     17: 36\*(rq of dots.)
                     18: The paper used is continuous roll paper, and comes in 500' rolls.
                     19: .PP
                     20: To use the Versatec yourself, you must realize that you cannot open the
                     21: device,
                     22: .I /dev/vp0
                     23: if there is a daemon active.
                     24: You can see if there is a daemon active by doing a
                     25: .IR ps (1),
                     26: or by looking in the directory
                     27: .I /usr/spool/vpd.
                     28: If there is a file
                     29: .I lock
                     30: there, then there is probably a daemon
                     31: .IR /usr/lib/vpd
                     32: running.
                     33: If not, you should remove the
                     34: .I lock.
                     35: .PP
                     36: In any case, when your program tries to open the device
                     37: .I /dev/vp0
                     38: you may get one of two errors.
                     39: The first of these
                     40: ENXIO
                     41: indicates that the Versatec is already in use.
                     42: Your program can then
                     43: .IR sleep (2)
                     44: and try again in a while, or give up.
                     45: The second is
                     46: EIO
                     47: and indicates that the Versatec is offline.
                     48: .PP
                     49: To set the Versatec into plot mode you can use the following
                     50: .IR ioctl (2)
                     51: call
                     52: .IP
                     53: ioctl(fileno(vp), VSETSTATE, plotmd);
                     54: .PP
                     55: where
                     56: .B plotmd
                     57: is defined to be
                     58: .IP
                     59: \fBint\fR plotmd[] = { VPLOT, 0, 0 };
                     60: .PP
                     61: and
                     62: .I vp
                     63: is the result of a call to
                     64: .I fopen
                     65: on stdio.
                     66: When you finish using the Versatec in plot mode you should eject paper
                     67: by sending it a EOT after putting it back into print mode, i.e. by
                     68: .sp .1i
                     69: 'nf
                     70: \fBint\fR prtmd[] = { VPRINT, 0, 0 };
                     71: \&...
                     72: fflush(vp);
                     73: ioctl(fileno(vp), VSETSTATE, prtmd);
                     74: write(fileno(vp), "\e04", 1);
                     75: .fi
                     76: .PP
                     77: .IR N.B. :
                     78: If you use the standard I/O library with the Versatec you
                     79: .B must
                     80: do
                     81: .IP
                     82: setbuf(vp, vpbuf);
                     83: .PP
                     84: where
                     85: .I vpbuf
                     86: is declared
                     87: .IP
                     88: \fBchar\fR vpbuf[BUFSIZ];
                     89: .PP
                     90: otherwise the standard I/O library, thinking that the Versatec
                     91: is a terminal (since it is a character special file) will not adequately buffer
                     92: the data you are sending to the Versatec.
                     93: This will cause it to run
                     94: .B extremely
                     95: slowly and tends to grind the system to a halt.
                     96: .SH FILES
                     97: /dev/vp0
                     98: .SH SEE ALSO
                     99: vfont(5), vpr(1), vtroff(1), va(4)
                    100: .SH BUGS

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