diff --git a/Platform/Apple/virtual/src/core/mem.s b/Platform/Apple/virtual/src/core/mem.s
index 9b266bed..8c120768 100644
--- a/Platform/Apple/virtual/src/core/mem.s
+++ b/Platform/Apple/virtual/src/core/mem.s
@@ -331,6 +331,13 @@ init: !zone
 	jsr main_dispatch
 	stx framePtr
 	stx outerFramePtr
+	stx .frameSet+1
+	stx frameChk+1
+	sty .frameSet+2
+	sty frameChk+2
+	lda #$AA		; store sentinel byte at bottom of frame
+.frameSet:
+	sta $1111		; self-modified above
 	iny			; twice for 2 pages: initial pointer at top of new space
 	iny
 	sty framePtr+1
@@ -630,6 +637,10 @@ __asmPlasm: !zone
 	pha		; and save that
 	cmp #$11	; again, X must be in range 0..$10
 	bcs .badx
+frameChk:
+	lda $1111	; self-modified by init code
+	cmp #$AA	; check for sentinel value
+	bne .badFrame
 	lda evalStkL,x	; get last param to A=lo
 	ldy evalStkH,x	; ...Y=hi
 .jsr	jsr $1111	; call the routine to do work
@@ -644,7 +655,9 @@ __asmPlasm: !zone
 .badx	; X reg ran outside valid range. Print and abort.
 	+prStr : !text $8D,"X=",0
 	+prX
-	jsr inlineFatal : !text "PlasmXRng", 0
+	jsr inlineFatal : !text "PlasmXRng",0
+.badFrame:
+	jsr inlineFatal : !text "PlasmFrm",0
 
 ;------------------------------------------------------------------------------
 ; Debug code to support macros
@@ -1072,7 +1085,6 @@ gc3_fix:
 	lda gcHash_dstHi,x
 +	sty pTmp		; store object pointer so we can dereference it
 	sta pTmp+1
-	+prWord pTmp
 	ldy #0			; first byte
 	lda (pTmp),y		;	is the type
 	bpl .outer		; 		or, if not hi bit, just a string so skip (no ptrs)
@@ -1147,12 +1159,6 @@ gc2_sweep: !zone
 	tax			; and in index for byte-copy count
 	lda tmp			; check for pSrc == pDst
 	beq .advDst		; if equal, no need to copy
-	
-	+prWord pSrc
-	+prStr : !text "->",0
-	+prWord pDst
-	+crout
-
 	inx			; set up to copy type/len byte as well
 .cplup	lda (pSrc),y
 	sta (pDst),y
@@ -1180,17 +1186,12 @@ gc2_sweep: !zone
 	sta heapTop
 	lda pDst+1
 	sta heapTop+1
-	+prWord heapTop
 	rts
 
 heapCollect: !zone
-	+prStr : !text "Phase 1.",0
 	jsr gc1_mark		; mark reachable blocks
-	+prStr : !text "Phase 2.",0
 	jsr gc2_sweep		; sweep them into one place
-	+prStr : !text "Phase 3.",0
 	jsr gc3_fix		; adjust all pointers
-	+prStr : !text "Phase 4.",0
 	jsr heapClr		; and clear newly freed space
 	lda #0			; heap end lo always 0
 	sec
diff --git a/Platform/Apple/virtual/src/plasma/gameloop.pla b/Platform/Apple/virtual/src/plasma/gameloop.pla
index 914c3c10..0bb4ba20 100644
--- a/Platform/Apple/virtual/src/plasma/gameloop.pla
+++ b/Platform/Apple/virtual/src/plasma/gameloop.pla
@@ -1505,7 +1505,7 @@ def freeObj(ptr)
   byte typeNum
   if ptr == NULL; return; fin
   typeNum = ^ptr
-  printf3("  freeObj p=$%x t=$%x ct=%d\n", ptr, typeNum, typeCounts[typeNum])
+  //printf3("  freeObj p=$%x t=$%x ct=%d\n", ptr, typeNum, typeCounts[typeNum])
   if typeCounts[typeNum] == 0
     fatal("Can't decr count past 0")
   fin
@@ -1744,12 +1744,14 @@ def randomHeapAction()
 
   // Random actions
   acted = FALSE
-  when rand16() % 11
+  when rand16() % 12
 
     // Add player
     is 0
     is 1
-      if countList(global=>players) < 10
+    is 2
+    is 3
+      if countList(global=>players) < 15
         puts("\n*** ADDING PLAYER ***\n")
         addPlayer()
         acted = TRUE
@@ -1757,8 +1759,8 @@ def randomHeapAction()
       break
 
     // Remove player
-    is 2
-      if countList(global=>players) > 5
+    is 4
+      if countList(global=>players) > 8
         puts("\n*** REMOVING PLAYER ***\n")
         p = randomFromList(global=>players)
         printf1("Unlinking player $%x\n", p)
@@ -1770,11 +1772,11 @@ def randomHeapAction()
       break
 
     // Add item
-    is 3
-    is 4
     is 5
+    is 6
+    is 7
       p = randomFromList(global=>players)
-      if p and countList(p=>items) > 2
+      if p and countList(p=>items) < 10
         puts("\n*** ADDING ITEM ***\n")
         addItem(p)
         acted = TRUE
@@ -1782,10 +1784,9 @@ def randomHeapAction()
       break
 
     // Remove item
-    is 6
-    is 7
+    is 8
       p = randomFromList(global=>players)
-      if p and countList(p=>items) > 0
+      if p and p=>items
         puts("\n*** REMOVING ITEM ***\n")
         p2 = randomFromList(p=>items)
         unlinkFromList(p + items, p2)
@@ -1795,22 +1796,20 @@ def randomHeapAction()
       break
 
     // Trade item
-    is 8
     is 9
+    is 10
       p = randomFromList(global=>players)
-      if p
+      if p and p=>items
+        puts("\n*** TRADING ITEM ***\n")
         p2 = randomFromList(p=>items)
-        if p2
-          puts("\n*** TRADING ITEM ***\n")
-          unlinkFromList(p + items, p2)
-          p = randomFromList(global=>players)
-          addToList(p + items, p2)
-        fin
+        unlinkFromList(p + items, p2)
+        p = randomFromList(global=>players)
+        addToList(p + items, p2)
       fin
       break
 
     // Garbage collect
-    is 10
+    is 11
       puts("\n*** COLLECTING GARBAGE ***\n")
       collect()
       acted = TRUE
@@ -1818,9 +1817,9 @@ def randomHeapAction()
 
   if acted
     mmgr(CHECK_MEM, 0)
-    puts("Hit a key: ")
-    getUpperKey()
-    crout()
+    //puts("Hit a key: ")
+    //getUpperKey()
+    //crout()
   fin
 end