sys_attrs_scc_input(5) [osf1 man page]

sys_attrs_scc(5)						File Formats Manual						  sys_attrs_scc(5)

NAME

       sys_attrs_scc, sys_attrs_scc_input - scc and scc_input subsystem attributes

DESCRIPTION

       This  reference	page  lists and describes attributes for the serial driver (scc) and keyboard driver (scc_input) kernel subsystems used on
       the DEC 3000 family of processors. Refer to the sys_attrs(5)  reference	page  for  an  introduction  to  the  topic  of  kernel  subsystem
       attributes.

   scc Subsystem
	      Number  of  configured  communication ports. On DEC 3000 family systems, communication ports are configured for the keyboard and the
	      mouse, in addition to terminals. The scc_cnt value is query only and cannot be changed by users.

	      Default value: 4 (configured communication ports)

	      The major number assigned to the device special files /dev/tty00 and /dev/tty01. The scc_major value is query  only  and	cannot	be
	      changed by users.

	      Default value: 24

   scc_input Subsystem
       The DEC 3000 serial keyboard scc_input kernel subsystem has an internal-only debugging attribute that users should never modify.

SEE ALSO

       sys_attrs(5)

																  sys_attrs_scc(5)

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