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--- qdosmsq:vectors:rchp [2008/06/27 20:26]
norman created
+++ qdosmsq:vectors:rchp [2008/06/27 20:29] (current)
norman Fixed bugs in three lines of code!
@@ Line 20: / Line 20: @@
   * Mainly used in device driver 'close' routines to deallocate space used for channel definition blocks and so on.
   * This vector call is //atomic//.
 ===== Example =====
-The example below shows the use of this trap call to obtain the address of the location of the system variables prior to some (unknown?) usage of that returned address.
+The example below shows the use of this vector to deallocate a previously allocated chunk of memory. For the sake of the example, the start address of the area is assumed to be on the top of the stack.
 <code>
 Kill_hp move.w  MM_RECHP,A2     ; MM_RECHP vector address.
-                                ; Assume A6 is correct already
+        movea.l (a7)+,a0        ; Unstack the start of the allocated area.
-	jsr	(a2)		; Make the call
+                                ; Assume A6 is correct already.
+        jsr      (a2)           ; Make the call.
         ...                     ; Carry on here.
 </code>