* Add Support for All 65C02 Opcodes and all Rockwell/WDC opcodes except WAI/STP

* Add 65C02 Opcode tests
* All tests pass, Klaus' 6502_functional_tests pass & Klaus' 65C02_extended_opcodes_test also all pass

src/test/java/com/loomcom/symon/Cpu65C02ZeroPageXModeTest.java

@@ -0,0 +1,69 @@
+package com.loomcom.symon;
+
+import com.loomcom.symon.devices.Memory;
+import com.loomcom.symon.exceptions.MemoryAccessException;
+import junit.framework.*;
+
+import static junit.framework.TestCase.assertFalse;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Test for Zero Page Indirect addressing mode, found on some instructions
+ * in the 65C02 and 65816
+ */
+public class Cpu65C02ZeroPageXModeTest extends TestCase {
+    protected Cpu    cpu;
+    protected Bus    bus;
+    protected Memory mem;
+
+    private void makeCmosCpu() throws Exception {
+        makeCpu(InstructionTable.CpuBehavior.CMOS_6502);
+    }
+
+    private void makeNmosCpu() throws Exception {
+        makeCpu(InstructionTable.CpuBehavior.NMOS_6502);
+    }
+
+    private void makeCpu(InstructionTable.CpuBehavior behavior) throws Exception {
+        this.cpu = new Cpu(behavior);
+        this.bus = new Bus(0x0000, 0xffff);
+        this.mem = new Memory(0x0000, 0xffff);
+        bus.addCpu(cpu);
+        bus.addDevice(mem);
+
+        // Load the reset vector.
+        bus.write(0xfffc, Bus.DEFAULT_LOAD_ADDRESS & 0x00ff);
+        bus.write(0xfffd, (Bus.DEFAULT_LOAD_ADDRESS & 0xff00) >>> 8);
+
+        cpu.reset();
+    }
+
+    public void test_STZ() throws Exception {
+        makeCmosCpu();
+        bus.write(0x0002,0xff);
+
+        bus.loadProgram(0x74,0x01);          // STZ Zero Page,X $01
+
+        // Test STZ Zero Page,X ($01+1)
+        assertEquals(0xff,bus.read(0x02, true));
+        cpu.setXRegister(0x01);
+        cpu.step();
+        assertEquals(0x00,bus.read(0x02, true));
+    }
+
+    public void test_STZRequiresCmosCpu() throws Exception {
+        makeNmosCpu();
+        bus.write(0x0002,0xff);
+
+        bus.loadProgram(0x74,0x01);          // STZ Zero Page,X $01
+
+        // Test STZ Zero Page,X ($01+1)
+        assertEquals(0xff,bus.read(0x02, true));
+        cpu.setXRegister(0x01);
+        cpu.step();
+        assertEquals(0xff,bus.read(0x02, true));
+
+    }
+
+}