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rfc:rfc119

Network Working Group M. Krilanovich Request for Comments: 119 UCSB NIC: 5831 April 21, 1971

                    NETWORK FORTRAN SUBPROGRAMS

Preface

 The subroutines described in this document have been implemented at
 UCSB and make the Network (via the NCP) accessible to Fortran
 programs executing in the 360/75.  They are callable from within any
 Fortran main program or subroutine compiled at UCSB.

Krilanovich [Page 1] RFC 119 Network Fortran Subprograms April 21, 1971

 A set of assembly-language written subprograms is provided to
 facilitate the sue of the Network by FORTRAN programmers.  They serve
 as an interface between the user and the Network Control Program
 (NCP), which supervises all Network operations at this site.
 A concept fundamental to FORTRAN Network operations is that of a
 completion code variable.  Associated with each socket that is not in
 the closed state is a unique variable, called a completion code
 variable.  This variable serves two purposes: it identifies the local
 socket referenced, and upon completion of the operation it contains a
 completion code to indicate the outcome of the operation to the
 programmer.  It may be used at any time for any purpose other than
 network operations.  Its value at the beginning of a Network
 operation is immaterial; rather it is the variable itself that is
 important.  In all Network operations, whenever a completion code
 variable is called for, the only acceptable type variable is
 INTERGER*4.
 In general, the subprograms will initiate the operation, and enter
 the WAIT state (consume no CPU time) until notified by the NCP of the
 completion of the operation.  For such operations, the programmer
 supplies a time limit, of type INTERGER*4, which specifies, in tenths
 of a second, the maximum length of time the subprogram is to wait for
 the operation to complete.  If this time limit is exceeded, a
 completion code is supplied to indicate the error; and control is
 returned to the calling program, with the operation still pending.
 In those operations requiring a socket to be specified by its socket
 identifier, the following format is used.  The identifier is
 specified as a INTEGER*4 array with at least two elements, or an
 element of such an array.  The first element specified is taken to be
 the site number, and the next element the socket number.  A socket
 number may have any value, positive, negative, or zero.  Since
 negative numbers are represented internally in two's complement form,
 for the purposes of the gender of a socket, a socket number is even
 for odd according to whether its absolute value is even or odd,
 respectively.
 Following is a description of each subprogram, its function and
 calling sequence.
 (1) OPEN
     By invoking this subprogram, the user requests that the specified
     local socket be removed from the closed state and thus be
     prepared to participate in data transfer.  There are three
     distinct operations that can be performed by this subprogram, and
     these are described below:

Krilanovich [Page 2] RFC 119 Network Fortran Subprograms April 21, 1971

     (A) CONNECT
         By initiating this operation, the user requests that the
         specified local socket be logically connected to the
         specified foreign socket, and that data transfer between the
         two sockets be enabled.  The subprogram will wait until the
         foreign socket either accepts or rejects the connection
         attempt.  This operation is valid only when the local socket
         is in the closed state.
            The calling sequence is as follows:
               CALL OPEN (cmpcd, time, lclsck, fgnsck, ws)
         where
              'cmpcd' is the completion code variable to be associated
                   with the local socket.
              'time' is the length of time the subprogram is to wait
                   for the completion of the operation.
              'lclsck' is the socket identifier of the local socket.
              'fgnsck' is the socket identifier of the foreign socket.
              'ws' is a workspace, which as the same attributes as a
                   socket identifier, and, if the operation is
                   successful, will become associated with the local
                   socket for the life of the connection.  In response
                   to certain future operations, information may be
                   returned to the programmer in this workspace.
              The following completion codes are possible for this
              operation:
                   0, The operation was successful and the connection
                      has been established
                   4, The specified completion code variable is
                      already assigned to a socket; the operation was
                      suppressed
                   8, The specified local socket is not in the closed
                      state; the operation was suppressed
                  12, All communication paths to the specified foreign
                      site are in use; the operation was suppressed

Krilanovich [Page 3] RFC 119 Network Fortran Subprograms April 21, 1971

                  16, Local resources are insufficient to support
                      another connection; the operation was suppressed
                  20, The connection attempt was rejected by the
                      foreign process
                  24, The specified local socket is not local to UCSB;
                      the operation was suppressed
                  28, The specified foreign site is invalid; the
                      operation was suppressed
                  32, An addressing or protection exception was
                      encountered with respect to the specified
                      workspace; the operation was suppressed
                  36, Either hardware at the foreign site is
                      inoperative or the NCP's counterpart at the
                      foreign site does not exist or has failed
                  40, Local and foreign sockets are both either send
                      or receive sockets; the operation was suppressed
                  44, By operator command, all Network operations were
                      terminated; the socket will be closed
                  60, An NCP control transmission error occurred; the
                      operation was suppressed
                 252, The specified time limit was exceeded; the
                      operation was initiated but not completed
     (B) LISTEN
         This operation is a request for notification of any
         connection attempt directed toward the specified local
         socket.  The subprogram waits until such a call is received,
         at which time the calling processes' socket identifier is
         returned to the calling program.  This operation is valid
         only when the designated local socket is in the closed state.
            The calling sequence is as follows:
               CALL OPEN (cmpcd, time, lclsck, ws)
         Where
              'cmpcd' is the completion code variable to be associated
                   with the local socket.

Krilanovich [Page 4] RFC 119 Network Fortran Subprograms April 21, 1971

              'time' is the length of time the subprogram is to wait
                   for the completion of the operation.
              'lclsck' is the socket identifier of the local socket.
              'ws' is a workspace which, if the operation is
                   successful, will contain the socket identifier of
                   the calling socket, and will become associated with
                   the local socket for the life of the connection.
                   'ws' has the same attributes as a socket
                   identifier.
              The following completion codes are possible for this
              operation:
                   0, The operation was successful and a call has been
                      received
                   4, The specified completion code variable is
                      already assigned to a socket; the operation was
                      suppressed
                   8, The specified local socket is not in the closed
                      state; the operation was suppressed
                  12, Local resources are insufficient to support
                      another connection; the operation was suppressed
                  16, The specified local socket is not local to UCSB;
                      the operation was suppressed
                  20, An addressing or protection exception was
                      encountered with respect to the specified
                      workspace; the operation was suppressed
                  44, By operator command, all Network operations were
                      terminated; the socket will be closed
                 252, The specified time limit was exceeded; the
                      operation was initiated but not completed
     (C) ACCEPT
         This operation accepts connection with the foreign socket
         whose call caused successful completion of a previous LISTEN
         operation by the specified local socket.  After completion of
         this operation, data may be transferred to or from the local
         socket, depending on its gender.  This operation is valid

Krilanovich [Page 5] RFC 119 Network Fortran Subprograms April 21, 1971

         only when the last operation referencing the local socket was
         a LISTEN operation.  The subprogram will wait until the
         operation is completed.
            The calling sequence is as follows:
               CALL OPEN (cmpcd, time)
         Where
              'cmpcd' is the completion code variable associated with
              the local socket by a previous LISTEN operation.
              'time' is the length of time the subprogram is to wait
              for the completion of the operation
           The following completion codes are possible for this
           operation:
                   0, The operation was successful, and the connection
                      is established
                   4, The specified local socket is in the closed
                      state 9The NCP may have received an abort
                      notification from the foreign process); the
                      operation was suppressed
                   8, the previous operation specifying the designated
                      local socket was not a LISTEN; the operation was
                      suppressed
                  12, All communication paths to the specified foreign
                      site are in use; the socket has been returned to
                      the closed state
                 252, the specified time limit was exceeded; the
                      operation was initiated but not completed
 (2) CLOSE
     This operation is a request that the specified local socket be
     returned to the closed state.  If the last operation involving
     this socket was a LISTEN, this operation refuses the foreign
     process' connection attempt.  If the last operation was CONNECT,
     the attempt is aborted.  If a connection is established, any data
     in transit from the local socket is allowed to reach the foreign
     socket to be either received or flushed before the local socket
     is closed.  The subprogram will wait until the socket has been
     returned to the closed state.

Krilanovich [Page 6] RFC 119 Network Fortran Subprograms April 21, 1971

        The calling sequence is as follows:
           CALL CLOSE (cmpcd, time)
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'time' is the length of time the subprogram is to wait
                   for the completion of the operation.
       The following completion codes are possible for this operation:
                   0, the operation was successful, and the socket has
                      been returned to the closed state
                   8, The specified completion code variable is not
                      currently assigned to a socket; the operation
                      was suppressed
                  12, The specified local socket is in the process of
                      being closed; the operation was suppressed, but
                      the local socket will be closed
                  36, Either hardware at the foreign site is
                      inoperative, or the NCP's counterpart at the
                      foreign site does not exist or has failed

Krilanovich [Page 7] RFC 119 Network Fortran Subprograms April 21, 1971

                  44, By operator command, all Network operations were
                      terminated; the socket will be closed
                  60, An NCP control transmission error occurred; the
                      operation was aborted
                  64, A transmission error occurred; the operation was
                      aborted, but the socket will be closed
                 252, The specified time limit was exceeded; the
                      operation was initiated but not completed
 3) SEND
     This program causes data to be sent to the foreign socket.  The
     subprogram will wait until the data has been received by the
     foreign socket, or until it has been queued locally by the NCP.
        The calling sequence is as follows:
           CALL WRITE (cmpcd, bfr, len, time [,offset])
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'bfr' is the data to be sent, and can be of any type,
                   any length.
              'len' is the number of bits of data to be sent.  If
                   'len' is non-positive, no operation is performed.
                   'len' is of type INTEGER*4.
              'time' is the length of time the subprogram is to wait
                   for the completion of the operation.
              'offset' is the bit offset from the first bit of 'bfr'
                   at which data transmission is to begin, and is of
                   type INTEGER*4.  If not specified, 'offset'
                   defaults to zero.
       The following completion codes are possible for this operation:
                   0, The operation was successful, and the data has
                      been sent
                   4, The specified local socket is not a send socket;
                      the operation was suppressed

Krilanovich [Page 8] RFC 119 Network Fortran Subprograms April 21, 1971

                   8, The specified completion code variable is not
                      assigned to a socket; the operation was
                      suppressed
                  12, A previous send operation is in progress; the
                      operation was suppressed
                  16, The connection is not fully open; the operation
                      was suppressed
                  20, The foreign socket terminated the connection
                      before completion of the send operation; not all
                      the data was transmitted
                  36, Either hardware at the foreign site is
                      inoperative, or the NCP's counterpart at the
                      foreign site does not exist or has failed
                  44, By operator command, all Network operations were
                      terminated; the socket will be closed
                  52, One or more interrupts were received from the
                      foreign socket; the operation was suppressed
                  56, An addressing exception was encountered with
                      respect to the data buffer; the operation was
                      suppressed
                  60, An NCP control transmission error occurred; the
                      operation was aborted and the socket will be
                      closed
                  64, A transmission error occurred; the operation was
                      aborted and the socket will be closed
                 252, The specified time limit was exceeded; the
                      operation was initiated but not completed
 4) RECEIVE
     This operation causes data to be received from the foreign
     socket.  The subprogram will wait until the reception of data is
     complete.
        The calling sequence is as follows:
           CALL READ (cmpcd, bfr, len, time [,offset])

Krilanovich [Page 9] RFC 119 Network Fortran Subprograms April 21, 1971

     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'bfr' is the variable into which the data is to be
                   placed, and can be of any type, any length.
              'len' is the number of bits of data to be received.  If
                   'len' is non-positive, no operation is performed.
                   'len' is of type INTEGER*4.
              'time' is the length of time the subprogram is to wait
                   for the completion of the operation.
              'offset' is the bit offset from the first bit of 'bfr'
                   at which the first bit of data is to be placed, and
                   is of type INTEGER*4.  If not specified, the
                   'offset' defaults to zero.
       The following completion codes are possible for this operation:
                   0, The operation was successful and the data has
                      been received
                   4, The specified local socket is not a receive
                      socket; the operation was suppressed
                   8, The specified completion code variable is not
                      assigned to a socket; the operation was
                      suppressed
                  12, A previous receive operation is in process; the
                      operation was suppressed
                  16, The connection is not fully open; the operation
                      was suppressed
                  20, The foreign socket terminated the connection
                      before completion of the receive operation; data
                      is unpredictable
                  24, An addressing or protection exception was
                      encountered with respect to the data buffer; the
                      operation was suppressed
                  36, Either hardware at the foreign site is
                      inoperative, or the NCP's counterpart at the
                      foreign site does not exist or has failed

Krilanovich [Page 10] RFC 119 Network Fortran Subprograms April 21, 1971

                  44, By operator command, all network operations were
                      terminated; the socket will be closed
                  52, One or more interrupts were received from the
                      foreign socket; the operation was suppressed
                  60, An NCP control transmission error occurred; the
                      operation was suppressed and the socket will be
                      closed
                 252, the specified time limit was exceeded; the
                      operation was initiated but not completed
 5) CHECK
     This operation causes the status of the specified local socket to
     be returned.  There is no completion code variable associated
     with this operation, since it is always successful and the socket
     is identified by its socket number.  This operation is valid at
     any time and is always completed immediately.
        The calling sequence is as follows:
        CALL CHECK (lclsck, stat, menu, fgnsck, deficit)
     Where
              'lclsck' is the socket identifier of the local socket.
              'stat' is a code for the status, and is of type
                   INTEGER*4.
              'mnem' is a mnemonic for the status, and can be of any
                   type, of any length greater than or equal to eight
                   bytes.
              'fgnsck' is the socket identifier of the foreign socket,
                   or zero.
              'deficit' is the send/receive deficit in bits, or zero,
                   and is to type INTEGER*4.
              'lclsck' is the only argument the programmer need
                   define; the others are output from the subprogram.

Krilanovich [Page 11] RFC 119 Network Fortran Subprograms April 21, 1971

 'STAT'    'MNEM'         MEANING
 ------    ------         ---------
   0        OPEN         A connection is fully established. No
                         SEND/RECEIVE operation is in progress.
                        'fgnsck' is the socket identifier of the
                         connected socket.  'deficit' is the number of
                         bites queued locally at the socket by the NCP
                         and available to satisfy a future RECEIVE
                         operation, or awaiting output ads the results
                         of a previous SEND operation.
   1       LISTEN        A LISTEN has been issued.
   2       CONNECT       A CONNECT has been issued. 'fgnsck' is the
                         socket identifier of the foreign socket.
   3       DECISION      A LISTEN has been completed.  'fgnsck' is
                         the socket identifier of the calling socket.
   4       CALL(S)       One or more calls have been received for the
                         local socket. No LISTEN or CONNECT has been
                         issued.
   5       I/O           A connection is fully established. A
                         SEND/RECEIVE operation is in progress.
                        'fgnsck' is the socket identifier of the
                         connected socket.  'deficit' is the number
                         of bits yet to be sent or received.
   6       CLOSED        The socket is in the closed state.
   7      <--DRAIN       The foreign socket is attempting to close the
                         connection.  The NCP has data yet to be ready
                         by the local socket.  'fgnsck' is the socket
                         identifier of the connected socket.
                        'deficit' is the number of bits yet to be
                         received.
   8       DRAINED       The foreign socket is attempting to close the
                         connection.  The NCP is awaiting arrival at
                         the foreign site of data currently in
                         transit.  'fgnsck' is the socket identifier
                         of the connected socket.
   9       CLOSING       The local socket has issued a CLOSE. The NCP
                         is in the process of returning the local
                         socket to the closed state. 'fgnsck' is the
                         socket identifier of the connected socket.

Krilanovich [Page 12] RFC 119 Network Fortran Subprograms April 21, 1971

  10       DRAIN-->      The local socket has issued a CLOSE.  The NCP
                         is completing the last SEND operation before
                         returning the local socket to the closed
                         state.  'fgnsck' is the socket identifier
                         of the connected socket. 'deficit' is the
                         number of bits the NCP has yet to transmit.
 (6) IDENTIFY
     This operation is used to identify a local socket by its
     completion code variable.  The operation is valid at any time,
     and is always completed immediately.  Since it is always
     successful, there are no completion codes for the operation, and
     the contents of the completion code variable are not changed.
        The calling sequence is as follows:
           CALL ID (cmpcd, lclsck)
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'lclsck' is set to the socket identifier of the local
                   socket if the completion code variable is
                   associated with a socket, or to zero otherwise.
 (7) SIGNAL
     This operation is used to convey a signal to the foreign process.
     The significance of the signal is completely user-dependent.  The
     effect is that the next time the foreign socket attempts to
     initiate a RECEIVE or SEND operation, the operation will be
     suppressed, and a completion code supplied indicating that a
     signal had been received.  The subprogram will wait until the
     signal has been sent to the foreign NCP.  This operation is valid
     only when the socket is fully open.
        The calling sequence is as follows:
           CALL SIGNAL (cmpcd, time)
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'time' is the length of time the subprogram is to wait
                   for completion of the operation.

Krilanovich [Page 13] RFC 119 Network Fortran Subprograms April 21, 1971

       The following completion codes are possible for this operation:
                   0, The operation was successful, and the signal has
                      been sent
                   4, The specified completion code variable is not
                      assigned to a socket; the operation was
                      suppressed
                   8, The connection is not fully open; the operation
                      was suppressed
     Certain of the Network subprograms are intended for, although not
     restricted to, use with the Online System Network operators.  The
     following is a general description of these operators:
        In all Network operations involving the Online System Network
        operators, there are certain conventions concerning the format
        of the data sent and received.  The data is grouped in
        'messages' consisting of three fields, op code, length, and
        text, in that order. The op code is one byte in length and is
        a code which indicates how the text field is to be
        interpreted.  The length field is two bytes long, and gives
        the length, in bits, of the text fields, which contains the
        actual data. (The op code and length fields together are
        termed a header.)

Krilanovich [Page 14] RFC 119 Network Fortran Subprograms April 21, 1971

     The following op codes are presently defined:
     Op Code   Meaning
       0       This op code is a NOP. No text field exists, and the
               contents of the length field are unpredictable. (This
               op code is used mainly as a delimiter.)
       1       The text field contains EBCDIC characters, one
               character per byte.  The Online System operators
               consider the characters as intended for display as soon
               as the text field has been received.
       2       The text contains codes for keypushes, one byte per
               key.  The Online operators consider the keys as
               intended for execution as soon as the text field has
               been received.
       3       The same as for an op code of 2, except that the Online
               operators consider that the execution of the keys will
               be delayed until all data for that receive operations
               has been received.
     The standard format of data sent or received by the Online System
     operators is a string of messages, with the last message
     indicated by a header with a NOP op code, called a trailer.
     These conventions are the default situation; any of them may be
     overridden by appropriate programming.
     Following are descriptions of those subprograms intended for use
     the Online System operators.
 (8) WRITE TO ONLINE CONSOLE
     This subprogram causes data, assumed to be characters represented
     by their EBCDIC codes, to be sent from the specified local
     socket.  The characters are sent in a standard message, preceded
     by a header, and optionally followed by a trailer.  The
     subprogram waits for the data to be received by the foreign
     socket, or to be queued locally by the NCP.  This operation is
     valid only when the local socket is a send socket, and is fully
     open.

Krilanovich [Page 15] RFC 119 Network Fortran Subprograms April 21, 1971

        The calling sequence is as follows:
           CALL WTOLC (cmpcd, bfr, len, level, across, down, time)
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'bfr' is the character string to be sent, and can be of
                   any type, any length.
              'len' in absolute value, is the number of characters to
                   be sent.  If 'len' is positive or zero, the end of
                   the data is indicated by a trailer; if 'len' is
                   negative, no trailer is sent.  'len' is of type
                   INTEGER*4.
              'level' indicates the mode of typing.  The absolute
                   value of 'level', if non-zero, is the shift level
                   on which to type, and must be less than or equal to
                   nine.  If greater than nine, one is sued.  If
                   'level' is positive, 'across' and 'down' are
                   relative to the current typing location.  If
                   'level' is negative, the carriage is positioned to
                   the upper left-hand corner before typing begins,
                   thus making 'across' and 'down' absolute
                   coordinates.  If 'level' is zero, the tying is in
                   case one characters, and a carriage return precedes
                   the positioning for 'across' and 'sown.' If the
                   characters to be displayed are case one characters,
                   the header sent will have an op code which
                   indicates characters to be displayed as soon as
                   they are received; otherwise, the op code will
                   indicate buttons to be executed as soon as
                   received. 'level' is of type INTEGER*4.
              'across' is the number of spaces to be moved
                   horizontally across the display tube before
                   beginning to type.  'across' can have any value,
                   positive, negative, or zero, and is type INTEGER*4.
              'time' is the length of time the subprogram is to wait
                   for completion of the operation.
                   The completion codes for this operation are the
                   same as for SEND.

Krilanovich [Page 16] RFC 119 Network Fortran Subprograms April 21, 1971

 (9) READ FROM ONLINE CONSOLE
     This subprogram receives data, assumed to be characters
     represented by their EBCDIC codes, from the foreign socket in one
     or more standard messages.  The subprogram will wait for the
     data, optionally followed by a trailer, to be received by the
     local socket.  This operation is valid only when the local socket
     is a receive socket and is fully open.
        The calling sequence is as follows:
           CALL RFOLC (cmpcd, bfr, len, time)
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'bfr' is the variable into which the data is to be
                   placed, and can be of any type, any length.
              'len', in absolute value, is the maximum number of
                   characters to be placed in 'bfr'.  If the length
                   fields of the head(s) received total more data than
                   'len', the excess data will be received, but will
                   not placed into 'brf', and will not be accessible
                   to the program.  If 'len' is positive or zero, data
                   will be received until a trailer is encountered.
                   If 'len' is negative, a single message, exclusive
                   of trailer, will be received. 'len' is of type
                   INTEGER*4.
              'time' is the length of time the subprogram is to wait
                   for completion of the operation.
                   The completion codes for this operation are the
                   same as for RECEIVE.
 (10) WRITE TO ONLINE CONSOLE WITH REPLY
     This subprogram combines the functions of 'WRITE TO ONLINE
     CONSOLE' and 'READ FROM ONLINE CONSOLE'.  The subprogram first
     sends a string of data to the foreign socket form the specified
     send socket, waits for it to be received by the foreign socket
     (or queued locally by the NCP), and then waits for a reply
     directed toward the specified receive socket.  The operation is
     valid only when the sockets have the correct gender and both are
     fully open.

Krilanovich [Page 17] RFC 119 Network Fortran Subprograms April 21, 1971

        The calling sequence is as follows:
           CALL WTOLCR (cmpcd, bfr, len, level, across, down, time,
           cmpcd2, bfr2, len2)
     Where
              'cmpcd' is the completion code variable associated with
                   the local send socket.
              'bfr' is as in 'WRITE TO ONLINE CONSOLE'.
              'len' is as in 'WRITE TO ONLINE CONSOLE'.
              'level' is an in 'WRITE TO ONLINE CONSOLE'.
              'across' as in 'WRITE TO ONLINE CONSOLE'.
              'down' is as in 'WRITE TO ONLINE CONSOLE'.
              'time' is the length of time the subprogram is to wait
                   for completion, individually, of the transmission
                   and reception of data.
              'cmpcd2' is the completion code variable associated with
                   the local receive socket.
              'brf2' is as 'bfr' in 'READ FROM ONLINE CONSOLE'.
              'len2' is as 'len' in 'READ FROM ONLINE CONSOLE'.
                   The completion codes for the send socket are the
                   same as for the SEND operation, and the completion
                   codes for the receive socket are the same as for
                   the RECEIVE operation.
 (11) ERASE
     This subprogram cause data constituting on Online System command
     to erase the display tube to be sent from the specified local
     socket.  The data is sent in a single standard message, including
     an op code indicating characters to be displayed as they are
     received, and optionally including a trailer.  The subprogram
     waits for the data to be received by the foreign socket, or to be
     queued locally by the NCP.  This operation is valid only when the
     local socket is a send socket, and is fully open.
        The calling sequence is as follows:

Krilanovich [Page 18] RFC 119 Network Fortran Subprograms April 21, 1971

           CALL ERASE ('cmpcd', 'delay1', 'delay2', 'time')
     Where
              'cmpcd' is the completion code variable associated with
                   the local socket.
              'delay1', in absolute value, is the length of time, in
                   tenths of a second, the subprogram is to pause (in
                   the WAIT state) before sending the erase.  If
                   'delay1' is positive or zero, a trailer will be
                   sent after the erase; if negative, no trailer will
                   be sent.  'delay1' is of type INTEGER*4.
              'delay2' is the length of time, in tenths of a second,
                   the subprogram is to pause after sending the erase
                   and before returning control to the calling
                   program, and is of type INTEGER*4.
              'time' is the length of time the subprogram is to wait
                   for completion of the operation.
                   The completion codes for this operation are the
                   same as for SEND.

Krilanovich [Page 19]

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