VP(4)                                                                    VP(4)



NAME
       vp - Versatec interface

SYNOPSIS
       device vp0 at uba0 csr 0177510 vector vpintr vpintr

DESCRIPTION
       The  Versatec  printer/plotter  is  normally used with the line printer
       system.  This description is designed for those who wish to  drive  the
       Versatec directly.

       To use the Versatec yourself, you must realize that you cannot open the
       device, _/_d_e_v_/_v_p_0 if there is a daemon active.  You can see if there  is
       a  daemon  active  by doing a _l_p_q(1), and seeing if there are any files
       being sent.  Printing should be turned off using _l_p_c(8).

       To set the Versatec into plot mode you should include <_s_y_s_/_v_c_m_d_._h>  and
       use the _i_o_c_t_l(2) call

              ioctl(fileno(vp), VSETSTATE, plotmd);

       where _p_l_o_t_m_d is defined to be

              int plotmd[] = { VPLOT, 0, 0 };

       and  _v_p  is  the  result  of a call to _f_o_p_e_n on stdio.  When you finish
       using the Versatec in plot mode you should eject paper by sending it  a
       EOT after putting it back into print mode, i.e. by

            int prtmd[] = { VPRINT, 0, 0 };
            ...
            fflush(vp);
            ioctl(fileno(vp), VSETSTATE, prtmd);
            write(fileno(vp), "\04", 1);

FILES
       /dev/vp0

SEE ALSO
       vfont(5), lpr(1), lpd(8), vtroff(1), va(4)

DIAGNOSTICS
       The  following  error numbers are significant at the time the device is
       opened.

       [ENXIO]   The device is already in use.

       [EIO]     The device is offline.

BUGS
       The configuration part of the driver assumes that the device is set  up
       to  vector  print mode through 0174 and plot mode through 0200.  As the
       configuration program can’t be sure which vector  interrupted  at  boot
       time, we specify that it has two interrupt vectors, and if an interrupt
       comes through 0200 it is reset to 0174.  This is safe for devices  with
       one or two vectors at these two addresses.  Other configurations with 2
       vectors may require changes in the driver.



4th Berkeley Distribution        May 14, 1986                            VP(4)