diff --git a/MC6809/MC6809.UnitTest/JsrTests.cs b/MC6809/MC6809.UnitTest/JsrTests.cs
new file mode 100644
index 0000000..0015f6f
--- /dev/null
+++ b/MC6809/MC6809.UnitTest/JsrTests.cs
@@ -0,0 +1,75 @@
+namespace EightBit
+{
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+    // https://github.com/sorenroug/osnine-java/blob/master/core/src/test/java/org/roug/osnine/BranchAndJumpTest.java
+
+    [TestClass]
+    public class JsrTests
+    {
+        private readonly Board board = new Board();
+        private readonly MC6809 cpu;
+
+        public JsrTests()
+        {
+            this.cpu = this.board.CPU;
+
+            this.board.Poke(0, 0x3a);
+        }
+
+        [TestInitialize]
+        public void Initialise()
+        {
+            this.board.RaisePOWER();
+            this.cpu.Step(); // Step over the reset
+        }
+
+        [TestCleanup]
+        public void Cleanup() => this.board.LowerPOWER();
+
+        // Test the JSR - Jump to Subroutine - instruction.
+        // INDEXED mode:   JSR   D,Y
+        [TestMethod]
+        public void TestJsr()
+        {
+            // Set up a word to test at address 0x205
+            this.cpu.PokeWord(0x205, 0x03ff);
+
+            // Set register D
+            this.cpu.D.Word = 0x105;
+
+            // Set register Y to point to that location minus 5
+            this.cpu.Y.Word = 0x200;
+
+            // Set register S to point to 0x915
+            this.cpu.S.Word = 0x915;
+
+            // Two bytes of instruction
+            this.board.Poke(0xB00, 0xAD);
+            this.board.Poke(0xB01, 0xAB);
+            this.board.Poke(0xB02, 0x11); // Junk
+            this.board.Poke(0xB03, 0x22); // Junk
+
+            this.cpu.PC.Word = 0xB00;
+            this.cpu.CC = 0;
+
+            this.cpu.Step();
+
+            Assert.AreEqual(0, this.cpu.CC);
+            Assert.AreEqual(0x01, this.cpu.A);
+            Assert.AreEqual(0x05, this.cpu.B);
+            Assert.AreEqual(0, this.cpu.DP);
+            Assert.AreEqual(0, this.cpu.X.Word);
+            Assert.AreEqual(0x200, this.cpu.Y.Word);
+            Assert.AreEqual(0x105, this.cpu.D.Word);
+            Assert.AreEqual(0x913, this.cpu.S.Word);
+            Assert.AreEqual(0, this.cpu.U.Word);
+            Assert.AreEqual(0x305, this.cpu.PC.Word);
+
+            Assert.AreEqual(2, this.board.Peek(0x914));
+            Assert.AreEqual(0xb, this.board.Peek(0x913));
+
+            Assert.AreEqual(10, this.cpu.Cycles);
+        }
+    }
+}
\ No newline at end of file
diff --git a/MC6809/MC6809.UnitTest/RtsTests.cs b/MC6809/MC6809.UnitTest/RtsTests.cs
new file mode 100644
index 0000000..b59a4d1
--- /dev/null
+++ b/MC6809/MC6809.UnitTest/RtsTests.cs
@@ -0,0 +1,47 @@
+namespace EightBit
+{
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+    // https://github.com/sorenroug/osnine-java/blob/master/core/src/test/java/org/roug/osnine/BranchAndJumpTest.java
+
+    [TestClass]
+    public class RtsTests
+    {
+        private readonly Board board = new Board();
+        private readonly MC6809 cpu;
+
+        public RtsTests()
+        {
+            this.cpu = this.board.CPU;
+
+            this.board.Poke(0, 0x3a);
+        }
+
+        [TestInitialize]
+        public void Initialise()
+        {
+            this.board.RaisePOWER();
+            this.cpu.Step(); // Step over the reset
+        }
+
+        [TestCleanup]
+        public void Cleanup() => this.board.LowerPOWER();
+
+        [TestMethod]
+        public void TestRts()
+        {
+            this.cpu.S.Word = 0x300;
+
+            this.cpu.PokeWord(0x300, 0x102C); // Write return address
+            this.board.Poke(0xB00, 0x39); // RTS
+
+            this.cpu.PC.Word = 0xB00;
+
+            this.cpu.Step();
+
+            Assert.AreEqual(0x102C, this.cpu.PC.Word);
+            Assert.AreEqual(0x302, this.cpu.S.Word);
+            Assert.AreEqual(5, this.cpu.Cycles);
+        }
+    }
+}
\ No newline at end of file