1 files changed, 16 insertions, 0 deletions
diff --git a/6502.lisp b/6502.lisp
index 1e9c7d4..7c0c2a7 100644
--- a/6502.lisp
+++ b/6502.lisp
@@ -202,6 +202,22 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
    (NOP 234 (implied))
    (BRK   0 (implied))))
 
+
+
+(defun extract-keys (list)
+  "Extract the keys of associative lists."
+  (let ((ret nil))
+	(progn
+	  (dolist (i list)
+		(setf ret
+			  (cons (car i) ret)))
+	  (reverse ret))))
+
+;; Generated list of opcodes.
+(setf
+ *opcodes*
+ (extract-keys *instructions*))
+
 (defun valid-instruction? (instruction addressing-mode)
   "Is instruction and addressing mode combination correct?"
   (cond