HEAPSIZE                      Set local heap size in bytes 
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 Purpose  : Set local heap size in bytes

 Syntax   : HEAPSIZE [size | MAXVAL]

 Example  : HEAPSIZE 3000

 This is used to set the size of the program's local heap in bytes. The heap
 is created in the default data segment after DGROUP, so its maximum size is
 determined by the size of DGROUP.

 The keyword MAXVAL can be used to set the heap size to 64kb minus the size
 of DGROUP, i.e. the maximum possible size.