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Finished implementing all implied mode instructions, with tests.

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Seth J. Morabito committed 2008-12-23 16:36:09 -08:00
1 parent f012ba7775
commit b46c4e1bec
2 files changed
+206 -29
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src/test/java/com/loomcom/symon/CpuImpliedModeTest.java
+169 -2
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@@ -386,7 +386,7 @@ public class CpuImpliedModeTest extends TestCase {
bus.loadProgram(0x60);
cpu.step();
assertEquals(0x0f10, cpu.getProgramCounter());
assertEquals(0x0f12, cpu.getProgramCounter());
assertEquals(0x20, cpu.getProcessorStatus());
}
@@ -414,9 +414,176 @@ public class CpuImpliedModeTest extends TestCase {
assertTrue(cpu.getIrqDisableFlag());
}
/* TAX - - $aa */
/* TAX - Transfer Accumulator to X Register - $aa */
public void test_TAX() {
cpu.setAccumulator(0x32);
bus.loadProgram(0xaa);
cpu.step();
assertEquals(0x32, cpu.getXRegister());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TAX_SetsZeroFlagIfXIsZero() {
cpu.setAccumulator(0x00);
bus.loadProgram(0xaa);
cpu.step();
assertEquals(0x00, cpu.getXRegister());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TAX_SetsNegativeFlagIfXIsNegative() {
cpu.setAccumulator(0xff);
bus.loadProgram(0xaa);
cpu.step();
assertEquals(0xff, cpu.getXRegister());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* TAY - Transfer Accumulator to Y Register - $a8 */
public void test_TAY() {
cpu.setAccumulator(0x32);
bus.loadProgram(0xa8);
cpu.step();
assertEquals(0x32, cpu.getYRegister());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TAY_SetsZeroFlagIfYIsZero() {
cpu.setAccumulator(0x00);
bus.loadProgram(0xa8);
cpu.step();
assertEquals(0x00, cpu.getYRegister());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TAY_SetsNegativeFlagIfYIsNegative() {
cpu.setAccumulator(0xff);
bus.loadProgram(0xa8);
cpu.step();
assertEquals(0xff, cpu.getYRegister());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* TSX - Transfer Stack Pointer to X Register - $ba */
public void test_TSX() {
cpu.setStackPointer(0x32);
bus.loadProgram(0xba);
cpu.step();
assertEquals(0x32, cpu.getXRegister());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TSX_SetsZeroFlagIfXIsZero() {
cpu.setStackPointer(0x00);
bus.loadProgram(0xba);
cpu.step();
assertEquals(0x00, cpu.getXRegister());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TSX_SetsNegativeFlagIfXIsNegative() {
cpu.setStackPointer(0xff);
bus.loadProgram(0xba);
cpu.step();
assertEquals(0xff, cpu.getXRegister());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* TXA - Transfer X Register to Accumulator - $8a */
public void test_TXA() {
cpu.setXRegister(0x32);
bus.loadProgram(0x8a);
cpu.step();
assertEquals(0x32, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TXA_SetsZeroFlagIfAccumulatorIsZero() {
cpu.setXRegister(0x00);
bus.loadProgram(0x8a);
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TXA_SetsNegativeFlagIfAccumulatorIsNegative() {
cpu.setXRegister(0xff);
bus.loadProgram(0x8a);
cpu.step();
assertEquals(0xff, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* TXS - Transfer X Register to Stack Pointer - $9a */
public void test_TXS() {
cpu.setXRegister(0x32);
bus.loadProgram(0x9a);
cpu.step();
assertEquals(0x32, cpu.getStackPointer());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TXS_DoesNotAffectProcessorStatus() {
cpu.setXRegister(0x00);
bus.loadProgram(0x9a);
cpu.step();
assertEquals(0x00, cpu.getStackPointer());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.setXRegister(0x80);
bus.loadProgram(0x9a);
cpu.step();
assertEquals(0x80, cpu.getStackPointer());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
/* TYA - Transfer Y Register to Accumulator - $98 */
public void test_TYA() {
cpu.setYRegister(0x32);
bus.loadProgram(0x98);
cpu.step();
assertEquals(0x32, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TYA_SetsZeroFlagIfAccumulatorIsZero() {
cpu.setYRegister(0x00);
bus.loadProgram(0x98);
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
public void test_TYA_SetsNegativeFlagIfAccumulatorIsNegative() {
cpu.setYRegister(0xff);
bus.loadProgram(0x98);
cpu.step();
assertEquals(0xff, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
}