4.3BSD-UWisc/man/cat4/vp.4

VP(4)               UNIX Programmer's Manual                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 can-
     not 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.





Printed 12/27/86          May 14, 1986                          1






VP(4)               UNIX Programmer's Manual                VP(4)



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.














































Printed 12/27/86          May 14, 1986                          2