xir man page on BSDOS

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XIR(4)			    BSD Programmer's Manual			XIR(4)

NAME
     xir - Xircom Pocket Ethernet III parallel-to-Ethernet adaptor

SYNOPSIS
     device xir0 at isa? port 0	  # on lp0
     device xir1 at isa? port 0	  # on lp1
     device xir2 at isa? port 0	  # on lp2

DESCRIPTION
     The xir interface provides access to a 10 Mb/s Ethernet network.  It sup-
     ports the Xircom PE-III parallel printer port adaptor.  It uses a hook in
     the lp driver to find out what port address and interrupt to use; the in-
     terface unit number (N in xirN) is assumed by the driver to correspond to
     a parallel port unit number (N in lpN), and the xir devices must there-
     fore follow the lp devices in the kernel configuration file (see
     config(8)).

     If your printer port can be set to different modes, either via DIP
     switches or the CMOS ``Setup'' screens, you may wish to try each mode in
     turn, measuring your throughput for each.	The driver will make use of
     ``enhanced'' or ``bidirectional'' modes if the port is so configured, but
     these modes are not always faster than ``standard'' mode.	Due to the
     lack of standardization among vendors, some ports which appear to the
     driver as ``enhanced'' or ``bidirectional'' may not work at all.  You may
     have to try several modes just to find one that works.

     On some laptop computers, the parallel port appears to support bidirec-
     tional transfers or enhanced mode even when you disable these capabili-
     ties in the CMOS ``Setup'' screens.  The xir driver will deliberately
     treat the port as unidirectional and unenhanced if you set the IFF_LINK0
     interface flag (using the link0 option to ifconfig(8)).  If your Xircom
     exhibits poor performance and you cannot find a CMOS configuration set-
     ting that improves it, try IFF_LINK0 before you give up.

DIAGNOSTICS
     The following diagnostics may be printed during autoconfiguration:

     WARNING: xir%d has its own IRQ (%d)

     An irq was specified on the xir device in the kernel configuration file.
     This is impossible since the associated lp device's interrupt is the only
     thing that can work.

     xir%d: only one Xircom allowed

     The xir driver is currently unable to support more than one adaptor per
     system.  As the PE-III is primarily used on laptop computers, this should
     not present a problem.

     xir%d: parallel port busy

     If the printer port is in use via its character interface (/dev/lpN) or
     by the pe driver, you will not be able to bring it up with the xir driv-
     er.

     xir%d: failed to initialize

     This is a general error condition that indicates a hardware or connection
     problem.  Re-seating the PE-III and rebooting your computer may help.

     xir%d: adapter disconnected: \
     (you may need ifconfig down/up to reactivate)

     If the adaptor loses power or is disconnected from the printer port, the
     driver might not be able to restart it without being told to do so by a
     command like ``ifconfig xirN down up''.

BUGS
     Many newer laptops do not interrupt properly on parallel printer port
     events.  This can manifest itself on the PE-III as poor performance when
     running multiuser.

     Multicast is presently handled in software, which is not good for perfor-
     mance.

SEE ALSO
     intro(4),	inet(4),  arp(4)

HISTORY
     The xir driver first appeared in BSDI.

BSDI BSD/OS		       December 14, 1994			     2
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