package com.loomcom.symon;
import com.loomcom.symon.devices.Memory;
import com.loomcom.symon.exceptions.MemoryAccessException;
import junit.framework.TestCase;
public class CpuAbsoluteXModeTest extends TestCase {
protected Cpu cpu;
protected Bus bus;
protected Memory mem;
protected void setUp() throws Exception {
this.cpu = new Cpu();
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();
// Assert initial state
assertEquals(0, cpu.getAccumulator());
assertEquals(0, cpu.getXRegister());
assertEquals(0, cpu.getYRegister());
assertEquals(0x200, cpu.getProgramCounter());
assertEquals(0xff, cpu.getStackPointer());
assertEquals(0x20, cpu.getProcessorStatus());
}
/*
* The following opcodes are tested for correctness in this file:
*
* ORA - $1d
* ASL - $1e
* AND - $3d
* ROL - $3e
* EOR - $5d
* LSR - $5e
* ADC - $7d
* ROR - $7e
* STA - $9d
* LDY - $bc
* LDA - $bd
* CMP - $dd
* DEC - $de
* SBC - $fd
* INC - $fe
*/
/* ORA - Logical Inclusive OR - $1d */
public void test_ORA() throws MemoryAccessException {
// Set some initial values in memory
bus.write(0x2c30, 0x00);
bus.write(0x2c32, 0x11);
bus.write(0x2c34, 0x22);
bus.write(0x2c38, 0x44);
bus.write(0x2c40, 0x88);
// Set offset in X register.
cpu.setXRegister(0x30);
bus.loadProgram(0x1d, 0x00, 0x2c, // ORA $2c00,X
0x1d, 0x02, 0x2c, // ORA $2c02,X
0x1d, 0x04, 0x2c, // ORA $2c04,X
0x1d, 0x08, 0x2c, // ORA $2c08,X
0x1d, 0x10, 0x2c); // ORA $2c10,X
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x11, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x33, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x77, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0xff, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* ASL - Arithmetic Shift Left - $1e */
public void test_ASL() throws MemoryAccessException {
bus.write(0x2c30, 0x00);
bus.write(0x2c31, 0x01);
bus.write(0x2c32, 0x02);
bus.write(0x2c33, 0x44);
bus.write(0x2c34, 0x80);
// Set offset in X register.
cpu.setXRegister(0x30);
bus.loadProgram(0x1e, 0x00, 0x2c, // ASL $2c00,X
0x1e, 0x01, 0x2c, // ASL $2c01,X
0x1e, 0x02, 0x2c, // ASL $2c02,X
0x1e, 0x03, 0x2c, // ASL $2c03,X
0x1e, 0x04, 0x2c); // ASL $2c04,X
cpu.step();
assertEquals(0x00, bus.read(0x2c30));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x02, bus.read(0x2c31));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x04, bus.read(0x2c32));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x88, bus.read(0x2c33));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x00, bus.read(0x2c34));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getCarryFlag());
}
/* AND - Logical AND - $3d */
public void test_AND() throws MemoryAccessException {
bus.write(0x1a30, 0x00);
bus.write(0x1a31, 0x11);
bus.write(0x1a32, 0xff);
bus.write(0x1a33, 0x99);
bus.write(0x1a34, 0x11);
bus.write(0x1a35, 0x0f);
bus.write(0x1a02, 0x11);
// Set offset in X register.
cpu.setXRegister(0x30);
bus.loadProgram(0x3d, 0x00, 0x1a, // AND $1a00,X
0x3d, 0x01, 0x1a, // AND $1a01,X
0xa9, 0xaa, // LDA #$aa
0x3d, 0x02, 0x1a, // AND $1a02,X
0x3d, 0x03, 0x1a, // AND $1a03,X
0x3d, 0x04, 0x1a, // AND $1a04,X
0xa9, 0xff, // LDA #$ff
0x3d, 0x05, 0x1a, // AND $1a05,X
0xa9, 0x01, // LDA #$01
0x3d, 0xd2, 0x19); // AND $19d2,X
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step(2);
assertEquals(0xaa, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x88, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step(2);
assertEquals(0x0f, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step(2);
assertEquals(0x01, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
/* ROL - Rotate Shift Left - $3e */
public void test_ROL() throws MemoryAccessException {
bus.write(0x1070, 0x00);
bus.write(0x1071, 0x01);
// Set offset in X register
cpu.setXRegister(0x70);
bus.loadProgram(0x3e, 0x00, 0x10, // ROL $1000,X (m=%00000000, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%00000010, c=0)
0x38, // SEC (m=%00000010, c=1)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%00000101, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%00001010, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%00010100, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%00101000, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%01010000, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%10100000, c=0)
0x3e, 0x01, 0x10, // ROL $1001,X (m=%01000000, c=1)
0x3e, 0x01, 0x10); // ROL $1001,X (m=%10000001, c=0)
cpu.step();
assertEquals(0x00, bus.read(0x1070));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x02, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step(2);
assertEquals(0x05, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x0a, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x14, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x28, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x50, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0xa0, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x40, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getCarryFlag());
cpu.step();
assertEquals(0x81, bus.read(0x1071));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
}
/* EOR - Exclusive OR - $5d */
public void test_EOR() throws MemoryAccessException {
bus.write(0xab40, 0x00);
bus.write(0xab41, 0xff);
bus.write(0xab42, 0x33);
bus.write(0xab43, 0x44);
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x88, // LDA #$88
0x5d, 0x10, 0xab, // EOR $ab10,X
0x5d, 0x11, 0xab, // EOR $ab11,X
0x5d, 0x12, 0xab, // EOR $ab12,X
0x5d, 0x13, 0xab); // EOR $ab13,X
cpu.step(2);
assertEquals(0x88, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getZeroFlag());
cpu.step();
assertEquals(0x77, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getZeroFlag());
cpu.step();
assertEquals(0x44, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getZeroFlag());
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getZeroFlag());
}
/* LSR - Logical Shift Right - $5e */
public void test_LSR() throws MemoryAccessException {
bus.write(0xab30, 0x00);
bus.write(0xab31, 0x01);
bus.write(0xab32, 0x02);
bus.write(0xab33, 0x44);
bus.write(0xab34, 0x80);
bus.write(0xab35, 0x02);
cpu.setXRegister(0x30);
bus.loadProgram(0x5e, 0x00, 0xab, // LSR $ab00,X
0x5e, 0x01, 0xab, // LSR $ab01,X
0x5e, 0x02, 0xab, // LSR $ab02,X
0x5e, 0x03, 0xab, // LSR $ab03,X
0x5e, 0x04, 0xab, // LSR $ab04,X
0x38, // SEC
0x5e, 0x05, 0xab); // LSR $ab05,X
cpu.step();
assertEquals(0x00, bus.read(0xab30));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x00, bus.read(0xab31));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getCarryFlag());
cpu.step();
assertEquals(0x01, bus.read(0xab32));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x22, bus.read(0xab33));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x40, bus.read(0xab34));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
// Setting Carry should not affect the result.
cpu.step(2);
assertEquals(0x01, bus.read(0xab35));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
}
/* ADC - Add with Carry - $7d */
public void test_ADC() throws MemoryAccessException {
bus.write(0xab40, 0x01);
bus.write(0xab41, 0xff);
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x00, // LDA #$00
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(2);
assertEquals(0x01, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(2);
assertEquals(0x80, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertTrue(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x80, // LDA #$80
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(2);
assertEquals(0x81, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0xff, // LDA #$ff
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(2);
assertEquals(0x00, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertTrue(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x00, // LDA #$00
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(2);
assertEquals(0xff, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(2);
assertEquals(0x7e, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0x80, // LDA #$80
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(2);
assertEquals(0x7f, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xa9, 0xff, // LDA #$ff
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(2);
assertEquals(0xfe, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
}
public void test_ADC_IncludesCarry() throws MemoryAccessException {
bus.write(0xab40, 0x01);
bus.loadProgram(0xa9, 0x00, // LDA #$00
0x38, // SEC
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x02, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
}
public void test_ADC_DecimalMode() throws MemoryAccessException {
bus.write(0xab40, 0x01);
bus.write(0xab41, 0x99);
bus.loadProgram(0xf8, // SED
0xa9, 0x01, // LDA #$01
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x02, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x49, // LDA #$49
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(3);
assertEquals(0x50, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x50, // LDA #$50
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(3);
assertEquals(0x51, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x99, // LDA #$99
0x7d, 0x10, 0xab); // ADC $ab10,X
cpu.step(3);
assertEquals(0x00, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertTrue(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x00, // LDA #$00
0x7d, 0x11, 0xab); // ADC $ab10,X
cpu.step(3);
assertEquals(0x99, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x49, // LDA #$49
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(3);
assertEquals(0x48, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
cpu.setXRegister(0x30);
bus.loadProgram(0xf8, // SED
0xa9, 0x50, // LDA #$59
0x7d, 0x11, 0xab); // ADC $ab11,X
cpu.step(3);
assertEquals(0x49, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
}
/* ROR - Rotate Right - $7e */
public void test_ROR() throws MemoryAccessException {
bus.write(0xab40, 0x00);
bus.write(0xab41, 0x10);
bus.loadProgram(0x7e, 0x10, 0xab, // ROR $ab10 (m=%00000000, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00001000, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00000100, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00000010, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00000001, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00000000, c=1)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%10000000, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%01000000, c=0)
0x7e, 0x11, 0xab, // ROR $ab11 (m=%00100000, c=0)
0x7e, 0x11, 0xab); // ROR $ab11 (m=%00010000, c=0)
cpu.setXRegister(0x30);
cpu.step();
assertEquals(0x00, bus.read(0xab40));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x08, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x04, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x02, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x01, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x00, bus.read(0xab41));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getCarryFlag());
cpu.step();
assertEquals(0x80, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x40, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x20, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
cpu.step();
assertEquals(0x10, bus.read(0xab41));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getCarryFlag());
}
/* STA - Store Accumulator - $9d */
public void test_STA() throws MemoryAccessException {
cpu.setXRegister(0x30);
cpu.setAccumulator(0x00);
bus.loadProgram(0x9d, 0x10, 0xab); // STA $ab10,X
cpu.step();
assertEquals(0x00, bus.read(0xab40));
// STA should have NO affect on flags.
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.reset();
cpu.setXRegister(0x30);
cpu.setAccumulator(0x0f);
bus.loadProgram(0x9d, 0x10, 0xab); // STA $ab10,X
cpu.step();
assertEquals(0x0f, bus.read(0xab40));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.reset();
cpu.setXRegister(0x30);
cpu.setAccumulator(0x80);
bus.loadProgram(0x9d, 0x10, 0xab); // STA $ab10,X
cpu.step();
assertEquals(0x80, bus.read(0xab40));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
/* LDY - Load Y Register - $bc */
public void test_LDY() throws MemoryAccessException {
bus.write(0xab45, 0x00);
bus.write(0xab46, 0x0f);
bus.write(0xab47, 0x80);
bus.loadProgram(0xbc, 0x10, 0xab, // LDY $ab10,X
0xbc, 0x11, 0xab, // LDY $ab11,X
0xbc, 0x12, 0xab); // LDY $ab12,X
cpu.setXRegister(0x35);
cpu.step();
assertEquals(0x00, cpu.getYRegister());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x0f, cpu.getYRegister());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x80, cpu.getYRegister());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* LDA - Load Accumulator - $bd */
public void test_LDA() throws MemoryAccessException {
bus.write(0xab42, 0x00);
bus.write(0xab43, 0x0f);
bus.write(0xab44, 0x80);
bus.loadProgram(0xbd, 0x10, 0xab, // LDA $ab10,X
0xbd, 0x11, 0xab, // LDA $ab11,X
0xbd, 0x12, 0xab); // LDA $ab12,X
cpu.setXRegister(0x32);
cpu.step();
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x0f, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x80, cpu.getAccumulator());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* CMP - Compare Accumulator - $dd */
public void test_CMP() throws MemoryAccessException {
bus.write(0xab40, 0x00);
bus.write(0xab41, 0x80);
bus.write(0xab42, 0xff);
cpu.setAccumulator(0x80);
bus.loadProgram(0xdd, 0x10, 0xab, // CMP $ab10,X
0xdd, 0x11, 0xab, // CMP $ab11,X
0xdd, 0x12, 0xab); // CMP $ab12,X
cpu.setXRegister(0x30);
cpu.step();
assertTrue(cpu.getCarryFlag()); // m > y
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag()); // m - y < 0
cpu.step();
assertTrue(cpu.getCarryFlag()); // m = y
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag()); // m - y == 0
cpu.step();
assertFalse(cpu.getCarryFlag()); // m < y
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag()); // $80 - $ff = $81
}
/* DEC - Decrement Memory Location - $de */
public void test_DEC() throws MemoryAccessException {
bus.write(0xab40, 0x00);
bus.write(0xab41, 0x01);
bus.write(0xab42, 0x80);
bus.write(0xab43, 0xff);
bus.loadProgram(0xde, 0x10, 0xab, // DEC $ab10,X
0xde, 0x11, 0xab, // DEC $ab11,X
0xde, 0x12, 0xab, // DEC $ab12,X
0xde, 0x13, 0xab); // DEC $ab13,X
cpu.setXRegister(0x30);
cpu.step();
assertEquals(0xff, bus.read(0xab40));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x00, bus.read(0xab41));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x7f, bus.read(0xab42));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0xfe, bus.read(0xab43));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
}
/* SBC - Subtract with Carry - $fd */
public void test_SBC() throws MemoryAccessException {
bus.write(0xab40, 0x01);
bus.loadProgram(0xa9, 0x00, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(2);
assertEquals(0xfe, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getCarryFlag());
cpu.reset();
bus.loadProgram(0xa9, 0x7f, // LDA #$7f
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(2);
assertEquals(0x7d, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
bus.loadProgram(0xa9, 0x80, // LDA #$80
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(2);
assertEquals(0x7e, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertTrue(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
bus.loadProgram(0xa9, 0xff, // LDA #$ff
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(2);
assertEquals(0xfd, cpu.getAccumulator());
assertTrue(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
cpu.reset();
bus.loadProgram(0xa9, 0x02, // LDA #$02
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(2);
assertEquals(0x00, cpu.getAccumulator());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertTrue(cpu.getZeroFlag());
assertTrue(cpu.getCarryFlag());
}
public void test_SBC_IncludesNotOfCarry() throws MemoryAccessException {
bus.write(0xab40, 0x01);
// Subtrace with Carry Flag cleared
bus.loadProgram(0x18, // CLC
0xa9, 0x05, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x03, cpu.getAccumulator());
cpu.reset();
// Subtrace with Carry Flag cleared
bus.loadProgram(0x18, // CLC
0xa9, 0x00, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0xfe, cpu.getAccumulator());
cpu.reset();
// Subtract with Carry Flag set
bus.loadProgram(0x38, // SEC
0xa9, 0x05, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x04, cpu.getAccumulator());
assertTrue(cpu.getCarryFlag());
cpu.reset();
// Subtract with Carry Flag set
bus.loadProgram(0x38, // SEC
0xa9, 0x00, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0xff, cpu.getAccumulator());
assertFalse(cpu.getCarryFlag());
}
public void test_SBC_DecimalMode() throws MemoryAccessException {
bus.write(0xab40, 0x01);
bus.write(0xab50, 0x11);
bus.loadProgram(0xf8, // SED
0xa9, 0x00, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x98, cpu.getAccumulator());
assertFalse(cpu.getCarryFlag()); // borrow = set flag
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0xf8, // SED
0xa9, 0x99, // LDA #$99
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x97, cpu.getAccumulator());
assertTrue(cpu.getCarryFlag()); // No borrow = clear flag
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0xf8, // SED
0xa9, 0x50, // LDA #$50
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x48, cpu.getAccumulator());
assertTrue(cpu.getCarryFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0xf8, // SED
0xa9, 0x02, // LDA #$02
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x00, cpu.getAccumulator());
assertTrue(cpu.getCarryFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertTrue(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0xf8, // SED
0xa9, 0x10, // LDA #$10
0xfd, 0x20, 0xab); // SBC $ab20,X
cpu.setXRegister(0x30);
cpu.step(3);
assertEquals(0x98, cpu.getAccumulator());
assertFalse(cpu.getCarryFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0x38, // SEC
0xf8, // SED
0xa9, 0x05, // LDA #$05
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(4);
assertEquals(0x04, cpu.getAccumulator());
assertTrue(cpu.getCarryFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
cpu.reset();
bus.loadProgram(0x38, // SEC
0xf8, // SED
0xa9, 0x00, // LDA #$00
0xfd, 0x10, 0xab); // SBC $ab10,X
cpu.setXRegister(0x30);
cpu.step(4);
assertEquals(0x99, cpu.getAccumulator());
assertFalse(cpu.getCarryFlag());
assertFalse(cpu.getNegativeFlag());
assertFalse(cpu.getOverflowFlag());
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getDecimalModeFlag());
}
/* INC - Increment Memory Location - $fe */
public void test_INC() throws MemoryAccessException {
bus.write(0xab30, 0x00);
bus.write(0xab31, 0x7f);
bus.write(0xab32, 0xff);
cpu.setXRegister(0x20);
bus.loadProgram(0xfe, 0x10, 0xab, // INC $ab10,X
0xfe, 0x11, 0xab, // INC $ab11,X
0xfe, 0x12, 0xab); // INC $ab12,X
cpu.step();
assertEquals(0x01, bus.read(0xab30));
assertFalse(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x80, bus.read(0xab31));
assertFalse(cpu.getZeroFlag());
assertTrue(cpu.getNegativeFlag());
cpu.step();
assertEquals(0x00, bus.read(0xab32));
assertTrue(cpu.getZeroFlag());
assertFalse(cpu.getNegativeFlag());
}
}