diff --git a/csys/csys.lisp b/csys/csys.lisp
index 316e8d7..e484707 100644
--- a/csys/csys.lisp
+++ b/csys/csys.lisp
@@ -73,7 +73,7 @@
           (util:lgw "proc not found" cat stg spec))
         proc))))
 
-(defun create-zero (prg env &key (categ '(:csys :c00)) (loc "0-0") (value 0))
+(defun create-zero (prg env &key (categ '(:csys :c00)) (loc #(0 0)) (value 0))
   (let* ((domain (car categ))
          (addr (list domain (cadr categ) loc))
          (msg (message:create (list domain :create) :data (list :addr addr)))
diff --git a/csys/program/basic.lisp b/csys/program/basic.lisp
index 8b47b80..464c411 100644
--- a/csys/program/basic.lisp
+++ b/csys/program/basic.lisp
@@ -24,7 +24,7 @@
   (lambda (msg scope) 
     (let ((self actor:*self*))
       (csys:send-create self :cat :e00 :connect :succ)
-      (csys:send-create self :cat :s00 :loc "0-1" :connect :pred)
+      (csys:send-create self :cat :s00 :loc #(0 1) :connect :pred)
       (csys:send-connect self self :op (csys:multiply -1))
       (csys:send-switch self :active)
       nil)))
@@ -33,7 +33,7 @@
 
 (defun config-b1 ()
   (list (prog-b1) :zero-cat :s01
-        :eff-contacts '(:e01 ("1-0" "1-1"))))
+        :eff-contacts '(:e01 (#(1 0) #(1 1)))))
 
 (defun prog-b1 ()
   (let ((val-action (csys:value-add :bias 2 :limits '(0)))) 
@@ -46,10 +46,10 @@
 (defun b1-next-zero ()
   (lambda (msg scope) 
     (let ((self actor:*self*))
-      (csys:send-create self :cat :e01 :loc "1-0" :value 2 :connect :succ)
-      (csys:send-create self :cat :e01 :loc "1-1" :value 2 
+      (csys:send-create self :cat :e01 :loc #(1 0) :value 2 :connect :succ)
+      (csys:send-create self :cat :e01 :loc #(1 1) :value 2 
                         :connect :succ :op (csys:multiply -1))
-      (csys:send-create self :cat :s01 :loc "0-1" :stage :basic)
+      (csys:send-create self :cat :s01 :loc #(0 1) :stage :basic)
       (csys:send-switch self :active)
       nil)))
  
@@ -57,8 +57,8 @@
   (lambda (msg scope) 
     (let ((self actor:*self*)
           (environ:*env* (csys:environ scope)))
-      (environ:send-connect self '(:e01 "1-0") :op (csys:multiply -1))
-      (environ:send-connect self '(:e01 "1-1"))
+      (environ:send-connect self '(:e01 #(1 0)) :op (csys:multiply -1))
+      (environ:send-connect self '(:e01 #(1 1)))
       (csys:send-switch self :active)
       nil)))
 
@@ -66,7 +66,7 @@
 
 (defun config-b2 ()
   (list (prog-b2) :zero-cat :c02 :zero-val 2
-        :eff-contacts '(:e02 ("2-0" "2-1"))))
+        :eff-contacts '(:e02 (#(2 0) #(2 1)))))
 
 (defun prog-b2 ()
   (let ((val-action (csys:value-add :bias 2 :limits '(0)))) 
@@ -80,9 +80,9 @@
 (defun b2-next-zero ()
   (lambda (msg scope) 
     (let ((self actor:*self*))
-      (csys:send-create self :cat :c02 :loc "0-1" :value 2 :stage :basic)
-      (csys:send-create self :cat :s02 :loc "1-0" :connect :pred)
-      (csys:send-create self :cat :e02 :loc "2-0" :connect :succ)
+      (csys:send-create self :cat :c02 :loc #(0 1) :value 2 :stage :basic)
+      (csys:send-create self :cat :s02 :loc #(1 0) :connect :pred)
+      (csys:send-create self :cat :e02 :loc #(2 0) :connect :succ)
       (csys:send-switch self :active)
       nil)))
  
@@ -90,9 +90,9 @@
   (lambda (msg scope) 
     (let ((self actor:*self*)
           (environ:*env* (csys:environ scope)))
-      (csys:send-create self :cat :s02 :loc "1-1" :connect :pred)
-      (csys:send-create self :cat :e02 :loc "2-1" :connect :succ)
-      (environ:send-connect self '(:c02 "0-0") :op (csys:multiply -1))
-      (environ:send-connect '(:c02 "0-0") self :op (csys:multiply -1))
+      (csys:send-create self :cat :s02 :loc #(1 1) :connect :pred)
+      (csys:send-create self :cat :e02 :loc #(2 1) :connect :succ)
+      (environ:send-connect self '(:c02 #(0 0)) :op (csys:multiply -1))
+      (environ:send-connect '(:c02 #(0 0)) self :op (csys:multiply -1))
       (csys:send-switch self :active)
       nil)))
diff --git a/test/test-core.lisp b/test/test-core.lisp
index 8a5e956..88b3864 100644
--- a/test/test-core.lisp
+++ b/test/test-core.lisp
@@ -134,11 +134,11 @@
 
 (deftest test-space ()
   (let ((idx (space:create)))
-    (space:put idx "1-1" 42)
-    (space:put idx "1-2" 46)
-    (space:put idx "1-1" 43)
-    (== (space:fetch idx "1-1") 43)
-    (== (space:fetch idx "1-2") 46)
+    (space:put idx #(1 1) 42)
+    (space:put idx #(1 2) 46)
+    (space:put idx #(1 1) 43)
+    (== (space:fetch idx #(1 1)) 43)
+    (== (space:fetch idx #(1 2)) 46)
     ))
  
 (deftest test-util-async ()
diff --git a/test/test-csys.lisp b/test/test-csys.lisp
index cc7a98a..141493c 100644
--- a/test/test-csys.lisp
+++ b/test/test-csys.lisp
@@ -77,20 +77,20 @@
   (let ((environ:*env* (setup (list (basic:prog-b0)))))
         ;(rcvr (tc:receiver t:*test-suite*))
     ;(tc:expect rcvr (message:create '(:csys :effect :e01) :data '(:value 1)))
-    (environ:send-value '(:s00 "0-1") 1)
-    (environ:send-value '(:s00 "0-1") 2)
+    (environ:send-value '(:s00 #(0 1)) 1)
+    (environ:send-value '(:s00 #(0 1)) 2)
     (teardown)))
 
 (deftest test-basic-1 ()
   (let ((environ:*env* (setup (basic:config-b1))))
-    (environ:send-value '(:s01 "0-0") 1)
-    (environ:send-value '(:s01 "0-1") 2)
+    (environ:send-value '(:s01 #(0 0)) 1)
+    (environ:send-value '(:s01 #(0 1)) 2)
     (teardown)))
 
 (deftest test-basic-2 ()
   (let ((environ:*env* (setup (basic:config-b2) :delay 0.03)))
-    (environ:send-value '(:s02 "1-0") 1) (sleep 0.0002)
-    (environ:send-value '(:s02 "1-1") 1) (sleep 0.0002)
-    (environ:send-value '(:s02 "1-0") 2)
+    (environ:send-value '(:s02 #(1 0)) 1) (sleep 0.0002)
+    (environ:send-value '(:s02 #(1 1)) 1) (sleep 0.0002)
+    (environ:send-value '(:s02 #(1 0)) 2)
     (teardown)))