DN11 Device Driver for RSX-11M


                                Author: B.Hazard
                               Date: Jan. 18, 1981
                               Revision: Number 1









DN11 DEVICE DRIVER FOR RSX11M, VR 3.1 - VR 3.2                PAGE 2
B. HAZARD


       GENERAL:



                The supplied  tape  for  this  driver  contains  the
            sources  and  indirect file for assembly prior to inclu-
            sion into the system.  Follow the procedures outlined in
            the  DN.CMD  file for inclusion of this driver into your
            system.

                The user should first copy the DN-11  indirect  file
            DN.CMD to a priviledged UIC on the system disk.  Use the
            command ....  
            >FLX /RS=(MM:) or (MT:)[311,1]DN.CMD/DO
                   
	     NOTE:  Read comments in  DN.CMD 
                    To execute the DN.CMD file and read 
                    the comments type >@DN (carriage return)

                The DN11 device  driver  was  developed  to  support
            auto-call procedures under RSX-11M .The driver is imple-
            mented as a user written driver,non-loadable.It supports
            only  one  physical device,with a maximum of four output
            ports.

                The DN11 device must use the standard CSR  addresses
            as recommended by D.E.C..  The four modules are serviced
            by a common interrupt vector in system  floating  vector
            space  (starting at 300).You may select the vector to be
            implemented by changing the interrupt  vector  field  in
            the  Status  Control Blocks located in the USRTB.MAC mo-
            dule supplied in the furnished kit.

                The DN11 kit includes source files for the driver as
            you  will  notice  requires the conditional DN$$04 to be
            satisfied this may be accomplished by using the supplied
            indirect assembly file.


       SCOPE:


                The DN11 driver handler uses  standard  RSX-11M  QIO
            functions.   ATTACHES  and DETACHES are not processed by
            the device driver.

       QIO$ IO.WLB, lun,ef,pri,iosb,ast,<ba,bc>

            The buffer address (ba) is  the  address  of  successive
            bytes  in the requesting task's address space containing
            the digits that are to be dialed.  The digits should  be
            binary  in the range of 0-9,but since the DN11 interface
            will accept only the four least significant bits of  the
            byte, ASCII may also work.Depending on what ACU (801) is


DN11 DEVICE DRIVER FOR RSX11M, VR 3.1 - VR 3.2                PAGE 3
B. HAZARD


            being used, numbers greater than 9 (decimal) may be used
            as  control  characters, such as end-of-number or tandem
            dialing.

            The byte count (bc) must be the number of digits  to  be
            presented  to  the ACU.  It must be valid reguardless of
            whether an end-of number digit is used.

       QIO$ IO.KIL,lun,ef,pri,iosb,ast

            Kill will abort the  current  operation  and  clear  the
            specified unit's status.

       I/O COMPLETION:

                The DNDRV acts as any RSX-11M device driver  as  far
            as  queuing and I/O completion.  The following is a list
            of possible I/O completions.

       IS.SUC (+1)
            The operation was  successful.This  indicates  that  the
            called party answered, that the answer tone was success-
            fully detected,and modem  coupler  cut-through  has  oc-
            curred.
       IE.TMO (-74.)
            After the last digit was presented to  the  auto-dialer,
            no  interrupt  was  received from the in the system unit
            time-out interval.That particular value is  set  in  the
            SCB  of  the  system data base for the device and may be
            set to a minimal value based on what type  of  telephone
            lines are being used.
       IE.CNR (-73.)
            Data line is currently occupied, either a  system  error
            in  I/O queuing or the device did not successfully clear
            after the last operation.
       IE.NFW (-69.)
            The ACU has interrupted  with  Abandon  Call  and  Retry
            (ACR) set.  Either it did not detect answer tone, or the
            ACU timed out waiting for the answer tone.  The time-out
            period may be strapped in the ACU and should be set sim-
            ilar to the system data base time-out value.
       IE.DNR (-3)
            Indicates a loss of power  during  dialing  sequence  or
            currently.   This  indicates  that only the ACU does not
            have power, not the entire system.
       IE.ABO (-15.)
            The operation was aborted by the QIO  IO.KIL  operation,
            or the system just performed a power fail recovery.