diff -c inform63-sv/asm.c inform63-tmp/asm.c
*** inform63-sv/asm.c	2006-11-04 19:50:30.000000000 -0500
--- inform63-tmp/asm.c	2007-02-04 20:51:14.000000000 -0500
***************
*** 41,46 ****
--- 41,48 ----
  
  int uses_unicode_features;         /* Makes use of Glulx Unicode (3.0)
                                        features?                              */
+ int uses_memheap_features;         /* Makes use of Glulx mem/heap (3.1)
+                                       features?                              */
  
  dbgl debug_line_ref;               /* Source code ref of current statement   */
  
***************
*** 300,305 ****
--- 302,308 ----
      /* Glulx: (bit flags for Glulx VM features) */
  
  #define GOP_Unicode    1   /* uses_unicode_features */
+ #define GOP_MemHeap    2   /* uses_memheap_features */
  
      /* Codes for the number of operands */
  
***************
*** 562,567 ****
--- 565,574 ----
    { (uchar *) "callfii",    0x0162, St, 0, 4 },
    { (uchar *) "callfiii",   0x0163, St, 0, 5 },
    { (uchar *) "streamunichar", 0x73,  0, GOP_Unicode, 1 },
+   { (uchar *) "mzero",      0x170,  0, GOP_MemHeap, 2 },
+   { (uchar *) "mcopy",      0x171,  0, GOP_MemHeap, 3 },
+   { (uchar *) "malloc",     0x178,  St, GOP_MemHeap, 2 },
+   { (uchar *) "mfree",      0x179,  0, GOP_MemHeap, 1 },
  };
  
  static opcodeg custom_opcode_g;
***************
*** 989,994 ****
--- 996,1004 ----
      if (opco.op_rules & GOP_Unicode) {
          uses_unicode_features = TRUE;
      }
+     if (opco.op_rules & GOP_MemHeap) {
+         uses_memheap_features = TRUE;
+     }
  
      no_operands_given = AI->operand_count;
  
***************
*** 2903,2908 ****
--- 2913,2919 ----
      for (i=0;i<16;i++) flags2_requirements[i]=0;
  
      uses_unicode_features = FALSE;
+     uses_memheap_features = FALSE;
  
      sequence_point_follows = TRUE;
      label_moved_error_already_given = FALSE;
diff -c inform63-sv/files.c inform63-tmp/files.c
*** inform63-sv/files.c	2006-11-04 19:50:30.000000000 -0500
--- inform63-tmp/files.c	2007-02-04 20:47:05.000000000 -0500
***************
*** 507,512 ****
--- 507,515 ----
      if (no_unicode_chars != 0 || (uses_unicode_features)) {
        VersionNum = 0x00030000;
      }
+     if (uses_memheap_features) {
+       VersionNum = 0x00030100;
+     }
  
      /* And check if the user has requested a specific version. */
      if (requested_glulx_version) {
diff -c inform63-sv/header.h inform63-tmp/header.h
*** inform63-sv/header.h	2006-11-04 19:50:30.000000000 -0500
--- inform63-tmp/header.h	2007-02-04 21:28:34.000000000 -0500
***************
*** 1118,1123 ****
--- 1118,1127 ----
  #define callfii_gc 78
  #define callfiii_gc 79
  #define streamunichar_gc 80
+ #define mzero_gc 81
+ #define mcopy_gc 82
+ #define malloc_gc 83
+ #define mfree_gc 84
  
  #define SYMBOL_TT    0                      /* value = index in symbol table */
  #define NUMBER_TT    1                      /* value = the number            */
***************
*** 1994,2000 ****
  
  extern int32 no_instructions;
  extern int   sequence_point_follows;
! extern int   uses_unicode_features;
  extern dbgl  debug_line_ref;
  extern int   execution_never_reaches_here;
  extern int   *variable_usage;
--- 1998,2004 ----
  
  extern int32 no_instructions;
  extern int   sequence_point_follows;
! extern int   uses_unicode_features, uses_memheap_features;
  extern dbgl  debug_line_ref;
  extern int   execution_never_reaches_here;
  extern int   *variable_usage;
diff -c inform63-sv/lexer.c inform63-tmp/lexer.c
*** inform63-sv/lexer.c	2006-11-04 19:50:30.000000000 -0500
--- inform63-tmp/lexer.c	2007-02-04 21:27:35.000000000 -0500
***************
*** 265,270 ****
--- 265,271 ----
      "linearsearch", "binarysearch", "linkedsearch",
      "callf", "callfi", "callfii", "callfiii", 
      "streamunichar",
+     "mzero", "mcopy", "malloc", "mfree",
      ""
  };