RUNOFF under RT-11


This  version of RUNOFF may be converted to RT-11, but the job will take a bit
of work.  The following suggestions may prove useful.  

     1.  Runoff  depends on section RNFIO for all I/O and RNORSX to set up the
         input and command parsing.   These  modules  will  require  extensive
         changes,  and  possibly  entirely new modules.  The module START con-
         tains all of the file OPEN and CLOSE calls.  The rest of the routines
         should require little or no modifacations.  

     2.  Most  symbols are defined in RNPRE.  This may be changed to personal-
         ize or convert features.  

     3.  The  input  line  from  RSX is assumed to be free of carriage control
         characters and for the purposes of RUNOFF both a carriage return  and
         line  feed  are  appended to the line.  I understand that under RT-11
         all text lines already have these carriage control in them.  The main
         job  would  be  unblocking the input lines from the input buffers and
         placing them into the input line buffer.  

     4.  The  routine GBYT,PBYT,GWRD,PWRD,FNDBF,SETBF,RSTBF,ENDBF are all used
         to access dynamic memory.  The main change that would have to be made
         is  in how the dynamic memory is obtained and returned to the dynamic
         pool.  Currently all of the dynamic memory is managed internally  and
         for RT you could use .SETTOP to add more memory as needed.  

     5.  If  changes are contemplated which use extended memory for the buffer
         pool, then a number of changes will be needed in RUNOFF,GCIN.   Every
         reference  to BF.ADD needs to be carefully looked at.  There are sev-
         eral places where I have assumed that having the memory address of  a
         byte  is sufficient to access it.  Unfortunately the Index BF.FUL(R3)
         will be needed instead.  You must then call FNDBF using the appropri-
         ate  index  before accessing the byte in the buffer.  After accessing
         it you may need to call FNDBF again with the restored index value  to
         return to regular processing or call ENDBF or RSTBF.  

     6.  The program must be overlayed if you wish to have a maximum of dynam-
         ic memory.  If you wish a non overlayed version and still  have  some
         dynamic  memory,  the call to HYPHEN inside of RUNOFF may be removed.
         This will effectively prevent AUTOHYPHENATION and allow you  to  dis-
         pense with the HYPHEN routine which is quite large.  

     7.  You  should be aware that every time LGO is entered the stack pointer
         is reset back to the initial bottom value.  In particular  this  hap-
         pens  at  the  beginning  of  each line, the end of each command, and
         after many of the error messages.  This particular  logic  simplifies
         the  error handling and prevents problems except to those who use the
         stack for permanent storage.