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NAME

sunio − Driver for Sun CPU on-board UART’s

SYNOPSIS

device sunio0 at obio

DESCRIPTION

sunio is the driver for the two serial lines handled by the Intel 8274 (alternatively the NEC PD7201) chip on the Sun CPU board.  Asynchronous speeds up to 19.2 KiloBaud are handled.  See the Sun Programmer’s Reference Manual for a complete description of the capabilities and limitations of these ports. 

This driver supports the normal UNIX system terminal interface as described in tty(4). In addition, the following ioctl calls are supported:

TIOCSBRK
sets the line to transmit a “break” condition.

TIOCCBRK
clears the transmission of a break.

TIOCSDTR
turns on the DTR indication on the line.

TIOCCDTR
turns on the DTR indication on the line.

TIOCSCTS
turns on CTS/RTS handshaking.  That is, transmit only when CTS is received.

TIOCSCTS, TIOCSDTR,and TIOCCDTR only work on port A of the Sun CPU board. 

FILES

/dev/ttya — port A
/dev/ttyb — port B

SEE ALSO

tty(4)

DIAGNOSTICS

Sun System Release 0.3  —  1 September 1981