diff --git a/correlate.rb b/correlate.rb
new file mode 100644
index 0000000000..245c38d1bc
--- /dev/null
+++ b/correlate.rb
@@ -0,0 +1,40 @@
+#!/usr/local/bin/ruby
+
+if ARGV.empty?
+  puts "usage: <delta value> <files ...>"
+  exit(1)
+end
+
+delta = ARGV.shift.to_i
+
+first = TRUE
+last = [ ]
+
+# simple algorithm, build up a list of all the possible addresses
+# calculating the delta range for each address in the file... then
+# just do a set intersection across these all and you have your results
+
+ARGV.each do |file|
+  cur = [ ]
+  IO.foreach(file) do |line|
+    addr = line.hex
+    (-delta .. delta).each do |d|
+      cur << addr + d
+    end
+  end
+
+  if first
+    first = FALSE
+    last = cur
+  else
+    last = last & cur
+  end
+    
+end
+
+# print da results
+
+last.each { |l|
+  puts "0x%08x" % l
+}
+