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  CONST
 
      StackLimit : Word = 0;    { stack pointer lower bound }
 
  Unit:     System (used automatically)
 
  Context:  SPtr, SSeg
 
  Description
 
    The StackLimit constant holds the limit that the stack may reach.
 
    The stack grows downward (toward 0) from the top of the stack
    segment. StackLimit holds the minimum address that the stack pointer
    may hold. The default is 0.
 
    The SP register holds the current offset of the stack pointer. The
    function SPtr returns the value of SP. The function SSeg returns the
    segment address of the stack.
 
    Control the total size of the stack with the $M compiler directive.