BOCA(4)                   OpenBSD Programmer's Manual                  BOCA(4)

NAME
     boca - multiplexing serial communications interface

SYNOPSIS
     For 4-port BB1004 boards and 8-port BB1008 boards:

     boca0 at isa? port 0x100 irq 5
     com* at boca?

     For 16-port BB2016 boards:

     boca0 at isa? port 0x100 irq 5
     boca1 at isa? port 0x140 irq 5
     com* at boca?

     (The BB2016 is functionally equivalent to two BB1008 boards, and is con-
     figured as such.)

DESCRIPTION
     The boca driver provides support for BOCA Research BB1004, BB1008, and
     BB2016 boards that multiplex together up to four, eight, or sixteen EIA
     RS-232C (CCITT V.28) communications interfaces.

     Each boca device is the master device for up to eight com devices.  The
     kernel configuration specifies these com devices as slave devices of the
     boca device, as shown in SYNOPSIS.  The slave ID given for each com de-
     vice determines which bit in the interrupt multiplexing register is test-
     ed to find interrupts for that device.  The port specification for the
     boca device is used to compute the base addresses for the com subdevices
     and the port for the interrupt multiplexing register.

FILES
     /dev/tty??

SEE ALSO
     com(4), intro(4), isa(4)

HISTORY
     The boca driver was written by Charles Hannum, based on the ast driver
     and source code from David Muir Sharnoff.  David wishes to acknowledge
     the assistance of Jason Venner in determining how to use the BOCA boards.

OpenBSD 4.7                      May 21, 2008                                1
