.\"	$OpenBSD: apci.4,v 1.1 2001/05/11 01:39:54 millert Exp $
.\
.\" Copyright (c) 1990, 1991, 1993
.\"	The Regents of the University of California.  All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the Systems Programming Group of the University of Utah Computer
.\" Science Department.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"    must display the following acknowledgement:
.\"	This product includes software developed by the University of
.\"	California, Berkeley and its contributors.
.\" 4. Neither the name of the University nor the names of its contributors
.\"    may be used to endorse or promote products derived from this software
.\"    without specific prior written permission.
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.\"     from: @(#)dca.4	8.1 (Berkeley) 6/9/93
.\"
.Dd May 10, 2001
.Dt APCI 4 hp300
.Os
.Sh NAME
.Nm apci
.Nd Apollo utility chip serial communications interface
.Sh SYNOPSIS
.Cd "apci* at frodo? offset ?"
.Sh DESCRIPTION
The Apollo utility chip contains four 8250-like UARTs and is found on
all series 400 machines.
The first UART is used to communicate with the Domain keyboard.
The second is the serial console port when the firmware is in Domain/OS
mode, and is mapped to select code 9 by the HP-UX firmware (except
on 425e models).  As such, the second UART is handled by the
.Xr dca 4
driver on all models but the 425e.
.Pp
There is no tty attached to the first UART as it lacks modem/flow
control and is directly connected to the keyboard connector.
.Pp
Input and output for each line may set to one of following baud rates;
50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400, 4800, 9600,
19200, or 38400.
.Sh FILES
.Bl -tag -width Pa
.It Pa /dev/ttya[0-3]
.It Pa /dev/cuaa[0-3]
.El
.Sh DIAGNOSTICS
.Bl -diag
.It apci%d: silo overflow.
The single-character input
.Dq silo
has overflowed and incoming data has been lost.
.El
.Sh SEE ALSO
.Xr tty 4
.Sh BUGS
Much of the code in the
.Nm
driver could be shared with the
.Xr dca 4
driver.