keyboard & monitor for SUn ultra enterprise 3000 Post: 302072045

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LEARN ABOUT NETBSD

scc

SCC(4)							   BSD Kernel Interfaces Manual 						    SCC(4)

NAME

     scc -- Zilog 8530 Serial Communications Controller interface

SYNOPSIS

     scc* at ioasic? offset ?

DESCRIPTION

     The scc driver provides support for the Zilog 8530 Serial Communications Controller (SCC) via the IOASIC found on DECstation 5000 models in
     the /100, /20, and /240 series (supported by NetBSD/pmax).

     Each SCC device has two serial ports.  The DECstation 5000 model 20 provides one SCC device.  Other models provide two, but one port of each
     device is dedicated to mouse and keyboard input, respectively.

     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, 38400, or 57600.

     Speeds up to 230400 are supported by the chip and the motherboard, but speeds higher than 57600 do not work reliably without an external
     clock signal.

FILES

     /dev/ttya
     /dev/ttyb
     /dev/ttyc
     /dev/ttyd

     The mapping from units to serial-hardware outlets is idiosyncratic.  The even ports are wired serial connectors and the odd-numbered ports
     are reserved for mouse and keyboard.

     On machines with one port like Personal DECstations, the single device is ttya.

     On the 5000/1xx and 5000/2xx, the first serial port (default serial console) is ttyc and the second port is ttya.

SEE ALSO

     intro(4), ioasic(4), ttys(5), MAKEDEV(8)

HISTORY

     The scc driver first appeared in 4.4BSD.

     The scc driver was also used for the IOASIC SCC found in DEC Alpha model 3000 TurboCHANNEL based systems; NetBSD/alpha has since been con-
     verted to use the machine-independent zstty(4).

BUGS

     The IOASIC provides internal DMA channels that can be programmed to transfer up to 4096 bytes of data into, or out, of an SCC without further
     software intervention.  This feature of the IOASIC is not yet supported.

     The mapping from device-special files (major and minor number) to chip and port is arguably backwards.  ULTRIX tries to hide the hardware
     mapping, but NetBSD does not.  Users wanting to use ULTRIX compatible tty names /dev/tty0 and /dev/tty1 for the scc comm-port lines should
     make links or device-special files which match their hardware setup.

BSD
								  April 24, 2003							       BSD