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diff --git a/src/boost/libs/safe_numerics/example/example91.cpp b/src/boost/libs/safe_numerics/example/example91.cpp
new file mode 100644
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+++ b/src/boost/libs/safe_numerics/example/example91.cpp
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+//////////////////////////////////////////////////////////////////
+// example91.cpp
+//
+// Copyright (c) 2015 Robert Ramey
+//
+// Distributed under the Boost Software License, Version 1.0. (See
+// accompanying file LICENSE_1_0.txt or copy at
+// http://www.boost.org/LICENSE_1_0.txt)
+
+#include <iostream>
+#include <limits>
+
+#include <boost/safe_numerics/cpp.hpp>
+#include <boost/safe_numerics/safe_integer.hpp>
+#include <boost/safe_numerics//safe_integer_range.hpp>
+
+// use same type promotion as used by the pic compiler
+// see the following comment in motor.c
+// Types: int8,int16,int32=8,16,32bit integers
+
+using pic16_promotion = boost::safe_numerics::cpp<
+    8,  // char
+    8,  // short
+    8,  // int
+    16, // long
+    32  // long long
+>;
+
+// define safe types used desktop version of the program.  In conjunction
+// with the promotion policy above, this will permit us to guarantee that
+// the resulting program will be free of arithmetic errors introduced by
+// C expression syntax and type promotion with no runtime penalty
+template <typename T> // T is char, int, etc data type
+using safe_t = boost::safe_numerics::safe<
+    T,
+    pic16_promotion,
+    boost::safe_numerics::default_exception_policy // use for compiling and running tests
+>;
+using safe_bool_t = boost::safe_numerics::safe_unsigned_range<
+    0,
+    1,
+    pic16_promotion,
+    boost::safe_numerics::default_exception_policy // use for compiling and running tests
+>;
+
+#define DESKTOP
+#include "motor1.c"
+
+#include <chrono>
+#include <thread>
+
+void sleep(int16){
+    std::this_thread::sleep_for(std::chrono::microseconds(ccpr));
+}
+
+int main(){
+    std::cout << "start test\n";
+    try{
+        initialize();
+        motor_run(100);
+        do{
+            isr_motor_step();
+        }while (run_flg);
+
+        // move motor to position 1000
+        motor_run(1000);
+        do{
+            sleep(ccpr);
+            isr_motor_step();
+        }while (run_flg);
+
+        // move back to position 0
+        motor_run(0);
+        do{
+            sleep(ccpr);
+            isr_motor_step();
+        }while (run_flg);
+    }
+    catch(std::exception & e){
+        std::cout << e.what() << '\n';
+        // we expect to trap an exception
+        return 0;
+    }
+    catch(...){
+        std::cout << "test interrupted\n";
+        return 1;
+    }
+    std::cout << "end test\n";
+    return 1;
+}