ss man page on Ultrix

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ss(4)									 ss(4)

Name
       ss - Small VAX serial line interface

Syntax
       device ss0 at uba0 csr 0x200a0000 flags 0x0f
	    vector ssrint ssxint

Description
       The  Small  VAX	serial	line controller is similar to the DZQ11 4-line
       communications multiplexer.  An interface provides  four	 communication
       ports  with  partial  modem control on port 2, adequate for dialup use.
       Only port 2 supports modem control (dialup access).   All  other	 ports
       must be operated as local lines.	 Each line attached to the serial line
       controller behaves as described in and may be set to run at any	of  16
       speeds.	For the encoding, see However, configuration requirements dic‐
       tate fixed speed operation of ports connected to the  console  terminal
       and graphics devices.

       The  Small  VAX may be configured as a workstation or a multiuser time‐
       sharing system.	For the workstation configuration, the ports are  used
       as follows:

       Port	 Usage
       0	 Graphics device keyboard at 4800 BPS
       1	 Mouse or tablet at 4800 BPS
       2	 Communications (with modem control)/local terminal
       3	 Serial printer port

       For the multiuser configuration, the port usage is:

       Port	 Usage
       0	 Console terminal at 9600 BPS
       1	 Local terminal line
       2	 Communications (with modem control)/local terminal
       3	 Local terminal or serial printer

       For  either  configuration,  a  diagnostic console terminal may be con‐
       nected to port 3 using a BCC08 cable.  For the multiuser configuration,
       while  the  diagnostic  console is connected, no other terminal devices
       can be connected.  When the diagnostic console is in use, the processor
       may be halted by pressing the BREAK key.

       The  selection  of which port to use for the console is made during the
       processor's power-on sequence and cannot be changed after power on.  If
       the  diagnostic console is connected, it is used; otherwise, the device
       connected to port 0 is the console.

       For the device, the flags should always be  specified  as:  flags  0x0f
       (all  4	lines  hardwired).   The state of port 2 can be established by
       specifying either modem or nomodem as part of the file entry for tty02;
       see  The default state of port 2 can be controlled by flags bit 2.  Set
       `flags 0x0f' for a hardwired line, `flags 0x0b'	for  dialup  operation
       (wait for carrier).

       The  driver operates in interrupt-per-character mode (all pending char‐
       acters are flushed from the silo on each interrupt).  Silo  alarm  mode
       is  used	 by the DZQ11 driver at times of high input character traffic.
       This mode is not used by the driver, due to the need to track mouse  or
       tablet position changes in real time.

   VAXstation 3100 Communications and Printer Ports
       The  VAXstation	3100  has  two	MMJ (Modified Modular Jack) connectors
       located at the rear of the system box. These MMJ connectors allow  con‐
       nection	of terminals, printers, and modems to the VAXstation 3100 sys‐
       tem.

       The ULTRIX logical names for these connectors are (the MMJ  closest  to
       the power connector) and (the MMJ next to the graphics connector).

       Terminals  and  printers can be connected to either the or MMJ.	Modems
       can be connected only to the MMJ.

       The VAXstation 3100 hardware provides only limited modem	 control  sup‐
       port.   The  DTR (Data Terminal Ready) and DSR (Data Set Ready) signals
       are the only modem control signals available at the  MMJ.   The	ULTRIX
       device  driver  for  has been modified to allow modems to function with
       the limited modem control provided by the  VAXstation  3100.   For  the
       modem  to function properly, it must be configured to drop DSR when the
       carrier drops; that is, the modem should not continuously assert DSR.

Restrictions
       The speed must be set to 9600 BPS on the console port and 4800  BPS  on
       ports  used  by	graphics  devices.  The console device must be set for
       8-bit character length with one stop bit and  no	 parity.   The	driver
       enforces	 these restrictions; that is, changing speeds with the command
       may not always work on these ports.

Diagnostics
       ss0: input silo overflow
       The 64-character input silo overflowed before  it  could	 be  serviced.
       This  can  happen  if  a hard error occurs when the CPU is running with
       elevated priority, as the system then prints a message on  the  console
       with interrupts disabled.

Files
       console terminal or graphics device

       not used

       local terminal - multiuser configuration only

       dialup or local terminal

       printer port or local terminal

       mouse or tablet - workstation configuration only

       console message window for monochrome workstations

       console message window for color workstations

See Also
       console(4), devio(4), sm(4), tty(4), ttys(5), MAKEDEV(8)

				      VAX				 ss(4)
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