NAME    [Toc]    [Back]

     hsq - multiplexing serial communications interface

SYNOPSIS    [Toc]    [Back]

     hsq0 at isa? port 0x140 irq 10
     com* at hsq? slave ?
     or
     pccom* at hsq? slave ?

DESCRIPTION    [Toc]    [Back]

     The hsq driver provides support for Hostess (Comtrol  Corporation,
     www.comtrol.com)  and  compatible  boards that multiplex together up to four
     EIA RS-232C (CCITT V.28) communications interfaces.

     Each hsq device is the master device for up to four com  devices.  The
     kernel  configuration  specifies  these com devices as slave
devices of the
     hsq device, as shown in SYNOPSIS.  The slave  ID  given  for
each com device
     determines  which bit in the interrupt multiplexing register
is tested to
     find interrupts for that device.  The port specification for
the hsq device
  is used to compute the base addresses for the com subdevices (they
     are equal to port + ID * 8) and the port for  the  interrupt
multiplexing
     register  (it is equal to port + 7).  More technical details
on how the
     driver works can be found in the big comment at  the  beginning of the
     driver's source code.

     Information on setup of card's configuration switches should
be taken
     from Comtrol Corporation's web site, since the author  wrote
and tested
     the driver only with Hostess-compatible cards.

FILES    [Toc]    [Back]

     /dev/tty0?
     /dev/cua0?

SEE ALSO    [Toc]    [Back]

     com(4), intro(4), isa(4)

HISTORY    [Toc]    [Back]

     The  hsq  driver was written by Denis A. Doroshenko based on
the ast(4)
     driver.

OpenBSD     3.6                          March      30,      1994