DCA(4)                OpenBSD Programmer's Manual (HP300)               DCA(4)

NAME
     dca - HP 98644A serial communications interface

SYNOPSIS
     dca0 at dio? scode 9 flags 1 (on-board serial interfaces)
     dca* at dio?

DESCRIPTION
     The 98644A is a single port EIA RS-232C (CCITT V.28) communications in-
     terface with a single character buffer.  Such an interface is built-in to
     all series 300 machines.

     Input and output for each line may be set to one of the following baud
     rates: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
     19200, 38400.

     An optional argument flags may be set to 1 if the line should be treated
     as hard-wired with carrier always present or 0 if modem control is de-
     sired.

FILES
     /dev/tty[0-3]
     /dev/cua[0-3]

DIAGNOSTICS
     dca%d: silo overflow.  The single-character input ``silo'' has overflowed
     and incoming data has been lost.

SEE ALSO
     dio(4), intro(4), tty(4)

BUGS
     Data loss is possible on busy systems with baud rates greater than 300.
     The dca has never been tested with modem control enabled or on anything
     but the built-in interface.

OpenBSD 4.7                     January 2, 2010                              1
