diff --git a/menelaus.scm b/menelaus.scm
index 7022818..d235a29 100644
--- a/menelaus.scm
+++ b/menelaus.scm
@@ -2,15 +2,60 @@
 
 ;; menelaus.scm
 
+(include "keyboard.scm")
+
+(define pressed 0)
+
+(define column-pins (list 11 12 15 14 10 4 7 8 9 5 6))
+(define layout (vector key-a key-s key-d key-f key-g
+                       key-h key-j key-k key-l key-semicolon))
+
+(define (scan-column pin keycode)
+  (if (and (= 0 pressed) (low? pin))
+      (set! pressed keycode)))
+
 (define (loop)
-  (if (low? 11)
-      (call-c-func "usb_send" 0 4 0 0 0 0 0)
-      (call-c-func "usb_send" 0 0 0 0 0 0 0))
+  (set! pressed 0)
+  ;; this causes a vector exception
+  ;; (for 0 10 (lambda (n) (scan-column (vector-ref column-pins n)
+  ;;                                    (vector-ref layout n))))
+  ;; while the unrolled version works great
+  (scan-column 11 key-a)
+  (scan-column 12 key-s)
+  (scan-column 15 key-d)
+  (scan-column 14 key-f)
+  (scan-column 10 key-g)
+
+  (scan-column 7 key-h)
+  (scan-column 8 key-j)
+  (scan-column 9 key-k)
+  (scan-column 5 key-l)
+  (scan-column 6 key-semicolon)
+  (call-c-func "usb_send" 0 pressed 0 0 0 0 0)
   (loop))
 
 (define (init)
-  (input 11)
-  (high 11) ; activate pullup resistor
+  ;; leonardo pins only go up to 13, but a-star goes to 19
+  (set! arduino-ports (vector #x29 #x29 #x29 #x29 #x29 #x26 #x29 #x2C
+                              #x23 #x23 #x23 #x23 #x29 #x26
+                              #x23 #x23 #x23 #x29 #x2D #x2D))
+  (set! arduino-pins (vector 4 8 2 1 16 64 128 64 16 32 64 128 64 128
+                             8 2 4 32 65 128))
+  ;; this causes a vector exception:
+  ;; (for-each-vector column-pins input)
+  ;; (for-each-vector column-pins high) ; activate pullup resistors
+  ;; while unrolling the loop works fine
+  (high 11)
+  (high 12)
+  (high 15)
+  (high 14)
+  (high 10)
+  (high 4)
+  (high 7)
+  (high 8)
+  (high 9)
+  (high 5)
+  (high 6)
   (call-c-func "usb_init")
   (pause 200))