diff --git a/Include/opcode.h b/Include/opcode.h
new file mode 100644
index 0000000..43ce54e
--- /dev/null
+++ b/Include/opcode.h
@@ -0,0 +1,78 @@
+/* Instruction opcodes for compiled code */
+
+#define DUP_TOP		0
+#define POP_TOP		1
+#define ROT_TWO		2
+#define ROT_THREE	3
+
+#define UNARY_POSITIVE	10
+#define UNARY_NEGATIVE	11
+#define UNARY_NOT	12
+#define UNARY_CONVERT	13
+#define UNARY_CALL	14
+
+#define BINARY_MULTIPLY	20
+#define BINARY_DIVIDE	21
+#define BINARY_MODULO	22
+#define BINARY_ADD	23
+#define BINARY_SUBTRACT	24
+#define BINARY_SUBSCR	25
+#define BINARY_CALL	26
+
+#define SLICE		30
+/* Also uses 31-33 */
+
+#define STORE_SLICE	40
+/* Also uses 41-43 */
+
+#define DELETE_SLICE	50
+/* Also uses 51-53 */
+
+#define STORE_SUBSCR	60
+#define DELETE_SUBSCR	61
+
+#define PRINT_EXPR	70
+#define PRINT_ITEM	71
+#define PRINT_NEWLINE	72
+
+#define BREAK_LOOP	80
+#define RAISE_EXCEPTION	81
+#define RETURN_VALUE	83
+#define REQUIRE_ARGS	84
+#define REFUSE_ARGS	85
+#define BUILD_FUNCTION	86
+#define POP_BLOCK	87
+#define END_FINALLY	88
+
+#define HAVE_ARGUMENT	90	/* Opcodes from here have an argument: */
+
+#define STORE_NAME	90	/* Index in name list */
+#define DELETE_NAME	91	/* "" */
+#define UNPACK_TUPLE	92	/* Number of tuple items */
+#define UNPACK_LIST	93	/* Number of list items */
+/* unused:		94 */
+#define STORE_ATTR	95	/* Index in name list */
+#define DELETE_ATTR	96	/* "" */
+
+#define LOAD_CONST	100	/* Index in const list */
+#define LOAD_NAME	101	/* Index in name list */
+#define BUILD_TUPLE	102	/* Number of tuple items */
+#define BUILD_LIST	103	/* Number of list items */
+#define BUILD_MAP	104	/* Always zero for now */
+#define LOAD_ATTR	105	/* Index in name list */
+#define COMPARE_OP	106	/* Comparison operator */
+#define IMPORT_NAME	107	/* Index in name list */
+#define IMPORT_FROM	108	/* Index in name list */
+
+#define JUMP_FORWARD	110	/* Number of bytes to skip */
+#define JUMP_IF_FALSE	111	/* "" */
+#define JUMP_IF_TRUE	112	/* "" */
+#define JUMP_ABSOLUTE	113	/* Target byte offset from beginning of code */
+#define FOR_LOOP	114	/* Number of bytes to skip */
+
+#define SETUP_LOOP	120	/* Target address (absolute) */
+#define SETUP_EXCEPT	121	/* "" */
+#define SETUP_FINALLY	122	/* "" */
+
+/* Comparison operator codes (argument to COMPARE_OP) */
+enum cmp_op {LT, LE, EQ, NE, GT, GE, IN, NOT_IN, IS, IS_NOT, EXC_MATCH, BAD};