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

NAME
     hsq - multiplexing serial communications interface

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

DESCRIPTION
     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 pccom devices.  The
     kernel configuration specifies these pccom devices as slave devices of
     the hsq device, as shown in the synopsis.  The slave ID given for each
     pccom 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 pccom subde-
     vices (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 driver works can be achieved from a big comment at the begining of
     the driver's source code.

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

FILES
     /dev/tty0?

     /dev/cua0?

SEE ALSO
     pccom(4)

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

OpenBSD 2.9                     March 30, 1994                               1
