work on Integer.to_s , not a simple task as it turns out

test/runners/fibo_while.rb

@@ -5,7 +5,8 @@ def fibonaccit(n) # n == r0
     tmp = a       # r3 <- r1
     a = b         # r1 <- r2
     b = tmp + b   #  r4 = r2 + r3  (r4 transient)  r2 <- r4 
-    putstring(b)   
+    tmp = inttos(b)
+    putstring(tmp)   
     n = n - 1      # r2 <- 0   ????   #call ok  
   end             #r5 <- r0 - 1                  # r0 <- r5
 end

test/runners/putint.rb

@@ -0,0 +1 @@
+putint( 42 )