diff --git a/pymlac/blockpunch.test b/pymlac/blockpunch.test
index 44c5100..1f55c0c 100644
--- a/pymlac/blockpunch.test
+++ b/pymlac/blockpunch.test
@@ -1,10 +1,11 @@
 # run the "blockpunch" program
-bootrom ptr; mount ptr blockpunch.ptp; trace 03540,03677; setreg pc 040; rununtil 0
-	mount ttyout xyzzy.out
+bootrom ptr; mount ptr dumpmem_test.ptp; setreg pc 040; rununtil 0	# load the test program into 0100-0110
+	mount ptr blockpunch.ptp; setreg pc 040; rununtil 0		# then load blockpunch
+	mount ttyout xyzzy.ptp						# punch the test program to xyzzy.ptp
 	setreg pc 03660; rununtil 0		# punch leader
 	setreg pc 03640; rununtil 0		# punch block loader
 	setreg pc 03660; rununtil 0		# punch leader
-	setreg ds 040; rununtil 0		# feed in start address 040
-	setreg ds 077; rununtil 0		# and end address 077
+	setreg ds 040; rununtil 0		# feed in start address 0100
+	setreg ds 077; rununtil 0		# and end address 0110
 	setreg pc 03670; rununtil 0		# punch memory and end leader