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

NAME
     apci - Apollo utility chip serial communications interface

SYNOPSIS
     apci* at frodo? offset ?

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 Do-
     main 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 dca(4) driver on all models but the 425e.

     There is no tty attached to the first UART as it lacks modem/flow control
     and is directly connected to the keyboard connector.

     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.

FILES
     /dev/ttya[0-3]

     /dev/cuaa[0-3]

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

SEE ALSO
     tty(4)

BUGS
     Much of the code in the apci driver could be shared with the dca(4) driv-
     er.

OpenBSD 2.9                      May 10, 2001                                1
