Added int16 (Keyboard) support, mostly stubs.

diff --git a/include/debugdefs.h b/include/debugdefs.h
index 7c1d255..74987bf5 100644
--- a/include/debugdefs.h
+++ b/include/debugdefs.h
@@ -4,7 +4,7 @@
 #include "debugtools.h"
 #endif
 
-#define DEBUG_CHANNEL_COUNT 144
+#define DEBUG_CHANNEL_COUNT 145
 #ifdef DEBUG_RUNTIME
 short debug_msg_enabled[][DEBUG_CLASS_COUNT] = {
 {1, 1, 0, 0},
@@ -151,6 +151,7 @@
 {1, 1, 0, 0},
 {1, 1, 0, 0},
 {1, 1, 0, 0},
+{1, 1, 0, 0},
 };
 const char* debug_ch_name[] = {
 "1",
@@ -211,6 +212,7 @@
 "imm",
 "int",
 "int10",
+"int16",
 "int21",
 "int31",
 "ipaddress",