C COMMON BLOCK FOR THE VIRTUAL MEMORY MANAGER
C
C NEXTPAGE  = NUMBER OF THE NEXT NEW PAGE
C ISIZEPAGE = NUMBER OF WORDS IN A PAGE
C NBUFFER   = NUMBER OF PAGES CONCURRENTLY IN CORE
C IPTRBUF   = ARRAY OF POINTERS TO THE BUFFERS IN CORE
C NBUFCNT   = NUMBER OF TIMES BUFFERS HAVE BEEN ACCESSED
C IPTRLRU   = POINTER TO START OF ARRAY OF THE LAST ACCESS COUNT
C             IN EACH BUFFER
C IPTRPAGE  = POINTER TO START OF ARRAY OF THE ID NUMBERS
C             OF THE PAGES IN CORE
C IPTRREC   = POINTER TO START OF ARRAY OF BUFFER NUMBERS
C             TELLING WHERE A PAGE LAST WAS (IS) IN CORE
C NBUFPAGE  = LENGTH OF IPTRREC ARRAY
C
      COMMON /COMVM/ NEXTPAGE, ISIZEPAGE, NBUFFER,  IPTRBUF,
     1               NBUFCNT,  IPTRLRU,   IPTRPAGE, IPTRREC,
     2               NBUFPAGE