apci - Apollo utility chip serial communications interface
apci* at frodo? offset ?
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
is in Domain/OS mode, and is mapped to select code 9 by the
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 be set to one of the following baud
rates: 50, 75, 110, 134.5, 150, 300, 600, 1200, 1800, 2400,
19200, or 38400.
apci%d: silo overflow. The single-character input ``silo''
and incoming data has been lost.
dca(4), dcm(4), frodo(4), intro(4), tty(4)
Much of the code in the apci driver could be shared with the
OpenBSD 3.6 May 10, 2001
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