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scc(7)

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NAME    [Toc]    [Back]

       scc - Serial keyboard/mouse/communications interface

SYNOPSIS    [Toc]    [Back]

       controller   scc0   at tc0   slot 3   vector sccintr

DESCRIPTION    [Toc]    [Back]

       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    [Toc]    [Back]

       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    [Toc]    [Back]

       console terminal local terminal local terminal

SEE ALSO    [Toc]    [Back]

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



                                                           scc(7)
[ Back ]
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