1 files changed, 1 insertions, 0 deletions
diff --git a/opcode.h b/opcode.h
index 40b832f..f5aeb0d 100644
--- a/opcode.h
+++ b/opcode.h
@@ -11,6 +11,7 @@
 
 #define OPNUM 74
 #define EXT_OPNUM 49
+#define ORTHO_OPNUM 16
 
 #define C (1 << 0) /* Carry flag. */
 #define Z (1 << 1) /* Zero flag. */