sys_attrs_scc(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(7)							 Miscellaneous Information Manual						    scc(7)

NAME

       scc - Serial keyboard/mouse/communications interface

SYNOPSIS

       controller   scc0   at tc0   slot 3   vector sccintr

DESCRIPTION

       Two  base  board  Zilog scc dual UARTS provide DEC 3000 series personal systems with keyboard, mouse, and serial communications interfaces.
       The serial communications interfaces can operate at baud rates from B50 to B57600 (see tty(7)).

       The driver for the scc interface supports hardware flow control using the Request to Send (RTS) and Clear  to  Send  (CTS)  signals.   When
       hardware  flow  control is enabled, the flow of input data is controlled by the RTS signal and the flow of output data is controlled by the
       CTS signal.  If the CTS signal is off, the driver will suspend output to that line until the CTS lead is reasserted.  Likewise, the  driver
       will  turn off the RTS lead to tell the device connected to the line to stop sending data as a result of congestion on the host side.  When
       the condition clears, the driver will turn on the RTS lead to tell the device to resume sending data.

       In alternate console configurations (that is, no graphics head), communications port 2 (/dev/tty01) becomes the system console. The  serial
       system console port always operates at 9600 BPS, 8-bits, no parity.  No modem or hardware flow control is supported.

RESTRICTIONS

       Data  communications  equipment attached to the console serial port in alternate console configurations must be set to 9600 BPS, 8-bits, no
       parity. The scc driver enforces this restriction.

       Only communications port 1 (/dev/tty00) includes full modem control.

FILES

       console terminal local terminal local terminal

RELATED INFORMATION

       console(7), devio(7), modem(7), tty(7), MAKEDEV(8) delim off

																	    scc(7)