diff --git a/TODO b/TODO
index 728efe2e5c..56eb530d53 100644
--- a/TODO
+++ b/TODO
@@ -21,7 +21,7 @@ NuttX TODO List (Last updated January 6, 2008)
   (2)  ARM/LPC214x (arch/arm/src/lpc214x/)
   (4)  pjrc-8052 / MCS51 (arch/pjrc-8051/)
   (2)  z80 (arch/z80/)
-  (3)  z16 (arch/z16/)
+  (4)  z16 (arch/z16/)
 
 o Task/Scheduler (sched/)
   ^^^^^^^^^^^^^^^^^^^^^^^
@@ -387,3 +387,9 @@ o z16 (arch/z16)
                examples/ostest/timedmqueue.c test.
   Status:      Open
   Priority:    Medium-High
+
+  Description: At present, the z16f port does not run properly when CONFIG_DEBUG
+               is disabled.  I have not determined the cause for this -- it
+               may be an issue with optimization?? Or clock setup??
+  Status:      Open
+  Priority:    Medium-High
\ No newline at end of file
diff --git a/configs/z16f2800100zcog/ostest/defconfig b/configs/z16f2800100zcog/ostest/defconfig
index 2c9815678e..ebb0cee8eb 100644
--- a/configs/z16f2800100zcog/ostest/defconfig
+++ b/configs/z16f2800100zcog/ostest/defconfig
@@ -139,7 +139,7 @@ CONFIG_HAVE_LIBM=n
 #   provides /dev/console.  Enables stdout, stderr, stdin.
 #
 CONFIG_EXAMPLE=ostest
-CONFIG_DEBUG=n
+CONFIG_DEBUG=y
 CONFIG_DEBUG_VERBOSE=n
 CONFIG_MM_REGIONS=1
 CONFIG_ARCH_LOWPUTC=n