$MODE

 The mode word of 4 ASCII characters must be written  by  the
 SSP   on   receipt   of   one  of  the  commands  listed  in
 COMMANDS_UNDERSTOOD_BY_ALL_SSPS.   The  mode  words   listed
 below have been defined so far:


 ------------------------------------------------------------------
 ASCII Mode word                 ASCII command read
 written by SSP                  from $COMMAND
 ------------------------------------------------------------------
 INIM    denotes receipt of      INIT
 STAM       "      "             STAR
 BSPM       "      "             BSPI
 EVNM       "      "             EVNT
 ESPM       "      "             ESPI
 PAUM       "      "             PAUS
 CONM       "      "             CONT
 GOIN    denotes that a command has been received, SSP has started.
 KRAP    denotes that an unrecognised command has been received

 The mode word "GOIN" is usually quickly overwritten  by  one
 of  the  other  mode  words,  but  is  useful  for debugging
 purposes.



 $RET_CODE

 The return code from the subroutines is  written  into  this
 location.   It  consists  of 4 ASCII characters.  The return
 codes defined so far are as follows:


       o  SUCC
          The subroutine has executed successfully.  The next
          command can be issued.  All the subroutines defined
          in COMMANDS_UNDERSTOOD_BY_ALL_SSPS must be able  to
          return this code.

       o  FAIL
          The subroutine has failed  for  some  reason.   The
          FAIL  return  code is considered a fatal error, and


          the reason for the failure must be investigated and
          corrected  before  continuing.  More information on
          the reason for failure can be found in  $MORE_INFO.
          All       the      subroutines      defined      in
          COMMANDS_UNDERSTOOD_BY_ALL_SSPS  must  be  able  to
          return this code.

       o  DFUL
          This return code must be returned by EVENT  if  the
          data  buffer  becomes full.  It is not considered a
          fatal error.  The condition  can  be  corrected  by
          sending  a  BEGIN_SPILL  command,  which resets the
          data  and  address  buffer   pointers.    In   some
          implementations,  other subroutines may return this
          code if desired.

       o  AFUL
          This return code must be returned by EVENT  if  the
          address  buffer becomes full It is not considered a
          fatal error.  The condition  can  be  corrected  by
          sending  a  BEGIN_SPILL  command,  which resets the
          data  and  address  buffer   pointers.    In   some
          implementations,  other subroutines may return this
          code if desired.




 $PROGID

 A unique ID of 4 ASCII  characters  should  be  assigned  to
 every  SSP  program that will be loaded into one of the SSPs
 in the BNL787 experiment.  (It is likely that every SSP will
 be loaded with a different program).  This program ID should
 be loaded into the location $PROGID after the command GO  is
 given,  so  that  the master can easily check which code has
 been loaded into any particular SSP.

 No SSP program IDs have yet  been  assigned.   It  would  be
 appreciated if SSP programmers would assign IDs to their own
 programs, and communicate them to the author  (SUZ@TRIUMFCL)
 to ensure that they remain unique.

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