PAR(7A)           MISC. REFERENCE MANUAL PAGES            PAR(7A)



NAME
     /dev/par - Amiga parallel port

SYNOPSIS
     #include <sys/types.h>
     #include <sys/par.h>

DESCRIPTION
     /dev/par is a special file which allows access to the  Amiga
     parallel  port.   This  port  is  a superset of a Centronics
     standard printer port, but this driver  does  not  currently
     support  anything other than normal Centronics printer usage
     (i.e., input is not supported).  The device must  be  opened
     with  O_WRONLY  mode.  This is a completely "raw" interface;
     absolutely no translation of data is done during  I/O.   The
     BUSY, SEL, POUT and ACK input status lines are normally used
     for handshaking on output; the first three can be  individu-
     ally set to be ignored.

IOCTL COMMANDS
     The parallel device supports ioctl(2) calls of the form:

          ioctl(fd, command, arg)
          int arg;

     The value of command determines the action taken:

          PIOCSETCTL
               Sets the bits  which  are  used  for  handshaking.
               This  setting  stays  in effect even across closes
               and reopens of the device.  Arg contains the logi-
               cal     or    of    any    of    the    following:
               PC_SEL,PC_POUT,PC_BUSY.   A  bit  which  is   zero
               causes  the  corresponding  handshake  line  to be
               ignored; lines which are not ignored  must  be  in
               their "ready" state for any output to occur.

FILES
     /dev/par - special file for accessing parallel port

SEE ALSO
     open(2), ioctl(2).













Amiga Unix          Last change: PRELIMINARY                    1