1.\" Copyright (c) 1990, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Systems Programming Group of the University of Utah Computer 6.\" Science Department. 7.\" %sccs.include.redist.man% 8.\" 9.\" @(#)dca.4 5.2 (Berkeley) 03/27/91 10.\" 11.Dd 12.Dt DCA 4 hp300 13.Os 14.Sh NAME 15.Nm dca 16.Nd 17.Tn HP 98644A 18communications interface 19.Sh SYNOPSIS 20.Cd "device dca0 at scode9 flags 0x1" 21.Sh DESCRIPTION 22The 23.Tn 98644A 24is a single port 25.Tn EIA 26.Tn RS-232C 27.Pf ( Tn CCITT 28.Tn V.28 ) 29communications interface with a single character buffer. 30Such an interface is built-in to all series 300 machines. 31.Pp 32Input and output for each line may set to one of following baud rates; 3350, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600 or 3419200. 35.Pp 36An optional argument 37.Ar flags 38may be set to 1 if the line should be treated as hard-wired 39with carrier always present or 0 if modem control is desired. 40.Sh FILES 41.Bl -tag -width Pa 42.It Pa /dev/tty0 43.El 44.Sh DIAGNOSTICS 45.Bl -diag 46.It dca%d: silo overflow. 47The single-character input 48.Dq silo 49has overflowed and incoming data has been lost. 50.El 51.Sh SEE ALSO 52.Xr tty 4 53.Sh HISTORY 54The 55.Nm 56driver 57.Ud 58.Sh BUGS 59Data loss is possible on busy systems with baud rates greater than 300. 60The 61.Nm dca 62has never been tested with modem control enabled or on anything but the 63built-in interface. 64