A FCS RESIDENT LIBRARY FOR RSX11M V3.2


          FCSRES.TSK is a working FCS resident library for use on an RSX11M
     V3.2  system.   All standard DEC utilities(except the RMS ones) can be
     built with it to provide both an in-core size  saving  and  a  on-disk
     size saving.  The savings vary from task to task but usually is around
     2K per task although the exact savings varies widely.  FCSRES.CMD will
     build FCSRES.TSK and FCSRES.STB and auto-ZAP its PSECT.  The following
     things should be kept in mind.  All of FCS can no longer  fit  in  the
     library.   The  changes  to  OPEN  midway  through V3.1 forced the old
     FCSRES.MAC to build a larger than 4K task.  Some less used items  have
     been removed.  But fear not.  The trick published in the software dis-
     patch of building the library, and then ZAPPING it's psect works  like
     a  charm.   Once  the psect is ZAPPED, no nasty taskbuilder error mes-
     sages will  appear,  and  all  the  utilites  work  with  breathtaking
     speed(at  least faster) which is possible when FCS overlays don't have
     to be called in.  The difference in loading one one's system  disk  is
     very  dramatic particularly when used with the new large F11ACP or the
     PLAS F11ACP.

          In all fairness  I  should  point  out  that  after  the  October
     Software  Dispatch  SLP  patches  are applied, the DEC FCSRES.MAC will
     probably work.  The DEC maintainer  feels  that  by  including  global
     references  to ARITH and DARITH that all taskbuilding problems are re-
     solved.  I am not quite so sure.  I seem to recall (back  when  I  was
     trying to find ways of building everything with FCSRES) that there may
     be a few things left which still won't build.  In time I will go  back
     and  try  rebuilding  everything  with  a new FCSRES and see if DEC is
     right.  For the present, ZAPPING the PSECT is foolproof and  will  in-
     sure that absolutely everything builds.

          Substantial system benifits result in building the utilities with
     an  FCS resident library.  Although none of the tasks decrease in size
     by anywhere close to 4K(they are  overlaid  to  the  teeth),  they  no
     longer  have to bring in overlays as they execute (or at least not the
     FCS ones).  This means that the total demand placed on the system disk
     goes  down abruptly.  Additionally, some tasks decrease dramaticaly in
     size.  The new print spooler tasks, and COT are HUGE without  building
     with  FCSRES.   Before  building them with FCSRES I was not sure I was
     going to be able to use them on our system.  They sit in core all  the
     time (stopped) and will checkpoint out when another task comes in, but
     they represented a lot of code to be constantly checkpointing  in  and
     out.  Built with FCSRES, they are small, checkpoint quickly and not as
     often because they don't fragment core as badly(we only have a  124  K
     machine).

          The command file, FCSRES.CMD will build a working FCSRES.MAC  and
     automatically  ZAP  its  PSECT.   However, for the more adventurous of
     you, I am including a tantalizing alternate FCSRES version.  This will
     support ANSI magtape(and BIG BUFFERING).  I must point out that I have
     not had the opportunity yet to build all tasks on my system with  this
     version,  but  I  expect to do so soon so that I can take advantage of


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     the big buffering in the present FCS.  In fairness I must admit that I
     did not create this version.  It was passed on to me by James Kirkman.
     For those with tighter core requirements, an ANSI FCSRES  is  provided
     which  maps  all  the  OPEN  routines  into one routine thereby saving
     enough space to insert the ANSI code.  Richard Kirkman states that  he
     has been using it with success on his system for a month or so.  If it
     works for him, it is probably very solid.